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과학 자연 사람 역사 지구 우주 심리 발명

1 W-113  [지구는 왜 둥글다고 할까] Why We Know Earth Is Round Long ago, people were not sure if Earth was flat or round. Over time, many proofs showed that Earth is a sphere. One strong proof comes from exploration. In the 16th century, Ferdinand Magellan and hi... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 2 W-113  [지구의 중심, 핵] Earth’s Core Deep inside Earth is the core, the hottest and heaviest part. It is made mostly of iron and nickel. These metals are very hot. Some are liquid, and some are solid. The core has two parts. The outer... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 3 W-108  [지구는 얼마나 빠르게 돌까?] How Fast Does Earth Spin? Earth is always spinning, but we do not feel it. At the equator, Earth spins at about 460 meters per second. That is 1,670 kilometers per hour. Earth makes one full spin every day. The speed is not... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 4 W-123  [지구를 지켜주는 자기장] Earth’s Magnetic Field Earth has a magnetic field that protects us from harmful space radiation. This field is made by moving liquid metal deep inside Earth. At the center, Earth has a solid iron core. Around it is hot, liq... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 5 W-109  [지구의 핵은 얼마나 뜨거울까?] How Hot Is Earth’s Core? Deep underground, Earth’s core is very hot—about 6,000°C, like the Sun’s surface. The core has two parts: the outer core and the inner core. The outer core is liquid iron and nickel. It moves a... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 6 W-114  [큰 운석이 바다에 떨어지면?] Big Meteorite Hits Every day, small meteorites enter Earth’s atmosphere. Most of them burn up before they hit the ground. But if a big meteorite falls into the ocean, it can cause a tsunami. The impact makes huge wave... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 7 W-110  [지구 대기는 어디까지일까?] Where Does Earth’s Atmosphere End? Earth’s atmosphere doesn’t stop suddenly. It gets thinner as we go higher. Scientists say space begins about 100 kilometers above Earth. This line is called the Kármán Line. After this, the air ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 8 W-112  [위성은 어떻게 지구를 돌까?] How Do Satellites Stay in Orbit? Satellites stay in orbit because of gravity and speed. Earth’s gravity pulls the satellite toward it. But the satellite moves forward very fast—about 28,000 km/h. This speed makes the satellite fa... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 9 W-122  [오로라는 왜 생길까] How Auroras Form Auroras are bright lights in the sky near the North and South Poles. They happen when particles from the Sun hit Earth’s atmosphere and make glowing colors. The Sun releases many charged particles, ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 10 W-142  [오존층과 CFC 이야기] The Ozone Layer and CFCs In the 1980s, scientists found a hole in the ozone layer. The hole was caused by chemicals called chlorofluorocarbons (CFCs). These chemicals were used in things like refrigerators and spray cans. Whe... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 11 W-111  [사용한 식용유의 재활용] Recycling Used Cooking Oil Used cooking oil is waste, but it can become biodiesel, a cleaner fuel than diesel. If people throw oil away in the wrong way, it can block drains and sewage pipes. This can cause pollution and floodi... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 12 W-132  [물 부족의 진짜 문제] The Real Problem of Water Shortage Many people think water is easy to get, but the world has a serious water shortage. In poor areas, many people—often women and girls—walk far every day to get water. The water is often dirty. Many... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 13 W-144  [영구동토층과 기후 변화] Permafrost and Climate Change In 2022, a gold miner in Canada found a baby woolly mammoth in very good shape. It was kept safe in the frozen Arctic ground called permafrost. Permafrost is ground that stays frozen for at least two ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 14 W-122  [사막의 태양광 발전] Solar Power in the Desert The Sahara Desert gets much more sunlight than people use in a year. Some people think solar panels in the desert could solve energy problems. Solar panels turn sunlight into electricity, but they onl... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 15 W-121  [생물다양성과 생태계 안정] Biodiversity and Ecosystem Stability Ecosystems on Earth may look stable, but they can collapse even without big disasters. Biodiversity helps ecosystems stay strong. It includes three parts: ecosystem diversity, species diversity, and g... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 16 W-157  [산성비와 환경 보호] Acid Rain and Environmental Protection In the 1960s, scientists found that rain in New Hampshire was very acidic. It was hurting nature. The cause was air pollution from power plants, cars, and factories. They released gases like sulfur di... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 17 W-137  [지진 예측의 어려움] The Challenge of Predicting Earthquakes In 132 AD, Zhang Heng from China made a tool to find earthquakes and show where they came from. Today, we use better tools, but it is still hard to predict earthquakes. This is because Earth’s plate... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 18 W-112  [바람과 전기] Wind and Electricity Each day, wind makes more energy than people use. Wind turbines turn wind’s moving power into electricity. The blades spin when wind blows. This turns a generator that makes electricity. The power d... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 19 W-112  [아마존과 하늘의 강] The Amazon and the Flying Rivers The Amazon rainforest has the Amazon River and “flying rivers.” These are humid air streams that carry more water than the river. Trees send water into the air through transpiration. Wind moves th... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 20 W-120  [기후 변화와 생물의 적응] Climate Change and Species Adaptation As climate change gets worse, animals and plants must change to survive. Humans use tools and technology. But other species depend on evolution. Evolution usually takes a long time, but fast climate c... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 21 W-120  [멕시코만 죽음의 바다] Dead Zones in the Gulf of Mexico Every summer, parts of the Gulf of Mexico become dead zones. These are places where fish and other sea life cannot live because there is no oxygen. This happens through a process called eutrophication... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 22 W-130  [이산화탄소와 기후 변화] Carbon Dioxide and Climate Change Carbon dioxide (CO2) is a greenhouse gas that causes climate change. It is part of the natural carbon cycle. The sun gives energy, and plants use it to take in CO2 during photosynthesis. They store it... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 23 W-132  [나무 심기의 효과] The Effects of Planting Trees Many people plant trees to fight climate change. Trees take in CO2 from the air. But planting many trees does not always work. From 1974 to 2012, Chile planted trees on over one million hectares. But ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 24 W-115  [화산은 어떻게 폭발할까] How Volcanoes Erupt Hot magma from inside the Earth can erupt when it reaches the surface. This happens because heat and pressure deep underground become very strong. Magma is molten rock, and it stays in a place called ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 25 W-129  [지진은 어떻게 일어날까] How Earthquakes Happen Earthquakes happen when the Earth’s crust moves or collides. The crust is made of big pieces called tectonic plates, and these plates move slowly all the time. Sometimes the plates push together or ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 26 W-120  [쓰나미는 어떻게 생길까] How Tsunamis Form Tsunamis are giant ocean waves that can flood coasts and destroy cities. They form when an earthquake or volcanic eruption happens under the sea. The ocean floor is made of big tectonic plates. Someti... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 27 W-115  [해는 왜 뜨고 질까] Why the Sun Seems to Rise and Set Every day, the Sun rises in the east and sets in the west. It looks like the Sun is moving, but Earth is the one that rotates. Earth spins on its axis once every 24 hours. When your side of Earth face... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 28 W-125  [사막은 왜 건조할까] Why Deserts Are So Dry Deserts are dry and sandy places with very little rain. They form in areas where almost no water reaches the ground. Without rain, plants cannot grow well, so the land has mostly sand and rocks. Many ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 29 W-112  [별이 반짝이는 것처럼 보이는 이유] Why Stars Seem to Twinkle At night, stars look like they twinkle, but their brightness does not really change. They only seem to twinkle because Earth’s atmosphere bends their light. Light from a star travels a long distance... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 30 W-131  [가장 깊은 바다, 마리아나 해구] The Mariana Trench The Mariana Trench is the deepest part of the ocean. It is in the Pacific Ocean and is about 11 kilometers deep. This is deeper than Mount Everest is tall. If Mount Everest were dropped into the trenc... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 31 W-106  [다이아몬드는 어떻게 만들어질까] How Diamonds Are Made Diamonds are one of the hardest materials on Earth. They are made deep underground from carbon. At about 150 to 200 kilometers below the surface, it is very hot and the pressure is very strong. In thi... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 32 W-110  [태양은 어떻게 변할까] What Will Happen to the Sun The Sun will not shine forever. In about 5 billion years, it will slowly change. Now, the Sun burns hydrogen to make energy. This is called a main-sequence star. But one day, the Sun will run out of h... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 33 W-148  [지구에서 가장 추운 곳] The Coldest Places on Earth The North Pole and South Pole are the coldest places on Earth. They stay frozen because they do not get much heat from the Sun. Sunlight hits them at a slanted angle, so the light spreads out and is n... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 34 W-116  [모래는 어떻게 만들어질까] How Sand Is Made Sand is made when rocks break into tiny pieces over a long time. Water, wind, and temperature changes slowly wear down rocks. When rainwater goes into cracks and freezes, it makes the rock break. Rive... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 35 W-111  [태풍과 허리케인] Typhoons and Hurricanes Typhoons and hurricanes are the same kind of storm but have different names. In the Pacific Ocean, they are called typhoons. In the Atlantic Ocean, they are called hurricanes. These storms form over w... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 36 W-130  [가장 밝은 별, 시리우스] Sirius: The Brightest Star Sirius is the brightest star in the night sky. It is in the Canis Major constellation, called the "Great Dog." That is why Sirius is also called the "Dog Star." It looks bright because it is close to ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 37 W-152  [조수는 왜 생길까?] What Causes Ocean Tides? The ocean is always moving. Sometimes the water rises and covers the shore. Other times it goes down and shows more land. This movement is called a tide. High tide is when the water is high. Low tide ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 38 W-115  [계절은 왜 바뀔까?] Why Seasons Change Seasons change because Earth is tilted as it moves around the Sun. Earth’s axis is tilted at 23.5 degrees. This tilt makes different parts of Earth get different sunlight during the year. When th... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 39 W-112  [별똥별은 진짜 별일까?] Are Shooting Stars Real Stars? A shooting star looks like a bright light in the night sky. It shines for a short time and then disappears. But it is not a real star. A shooting star is a small space rock burning in Earth’s atmosp... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 40 W-104  [세상에서 가장 깊은 동굴] The Deepest Cave in the World Veryovkina Cave is the deepest cave on Earth. It is over 2,000 meters deep and is in Georgia, a country in Eastern Europe. The cave is in a mountain area called the Arabika Massif. People first explor... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 41 W-111  [공기는 무게가 있을까?] Does Air Have Weight? Air is invisible, and we do not feel its weight. But air is made of tiny particles, and these particles have mass. Together, they give air weight. We can measure this using air pressure. Air pressu... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 42 W-107  [남극 얼음 아래 숨겨진 호수] Hidden Lakes Beneath Antarctica Under the thick ice of Antarctica, scientists found huge lakes. These lakes have been trapped for millions of years. The biggest one is Lake Vostok. It lies under 4,000 meters of ice and is as big as ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 43 W-110  [바닷속에도 강이 흐를까?] Do Rivers Flow Under the Ocean? It may sound strange, but rivers can flow under the ocean. These underwater rivers form when salty water and fresh water mix. Saltier water is heavier, so it sinks. Fresher water stays on top. This ma... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 44 W-109  [남극이 더 추운 이유] Why the South Pole Is Colder The South Pole is colder than the North Pole. Antarctica, where the South Pole is, has the coldest temperatures on Earth. Its average temperature is about -57°C. The North Pole is warmer, with about ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 45 W-109  [우주에서 물은 어떻게 움직일까?] How Water Moves in Space On Earth, gravity pulls water down into rivers and oceans. But in space, there is no gravity, so water acts differently. It does not fall. Instead, it forms floating balls. This happens because of ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 46 W-107  [세상에서 가장 오래된 나무] The Oldest Tree in the World The oldest tree in the world is a Bristlecone pine named Methuselah. It is about 4,800 years old and lives in the White Mountains in California, USA. It has survived strong winds, poor soil, and littl... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 47 W-110  [세상에서 가장 큰 폭포] Waterfall Is Under the Ocean When we think of waterfalls, we imagine water falling from tall cliffs. But the biggest waterfall on Earth is under the ocean! It is called the Denmark Strait Cataract. It is between Greenland and Ice... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 48 W-111  [호수가 분홍색인 이유] Why Some Lakes Are Pink Some lakes in the world are pink, not blue. These pink lakes look very special. They turn pink because of salt and tiny living things in the water. These lakes have a lot of salt—sometimes more t... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING 49 W-118  [빙하가 녹으면 어떤 일이 생길까?] What Happens When Glaciers Melt? Glaciers are big blocks of ice found in Antarctica, the Arctic, and tall mountains. They have been around for thousands of years. But now, many glaciers are melting because of climate change. When ... E-BOOK K-BOOK VOCA COLC ORDER SPEAKING © 2026 SPEAK TOWN ENGLISH - LINGUA LABS