학습안내
개념어휘
인문학
통합사회
통합과학
뉴스와 사설
MY PAGE



                       

1
W-102  [자석의 신비] The Power of Magnets
Magnets are amazing tools. Each magnet has two poles called the north pole and the south pole. These poles act in special ways. Different poles attract, so a north pole pulls the south pole of another...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
2
W-106  [공기란 무엇일까] The Invisible but Powerful Air
Air is all around us. It is everywhere we go. Air is a mix of gases. We cannot see air, but we can feel it when wind moves. We need air to breathe, and life cannot exist without it. Air has special fe...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
3
W-110  [공기가 움직이는 원리] The Magic of Moving Air
Air is around us, but we cannot see it. Air is invisible, but it can move from one place to another. Tom wanted to see how air moves, so he did a simple experiment. He got a volleyball, a balloon, and...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
4
W-129  [대칭이란 무엇일까] The Fun of Symmetry
Symmetry means an object looks the same on both sides. When an object is symmetric, one side matches the other side. You can measure symmetry in simple ways. For example, you can put the middle part o...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
5
W-131  [액체의 신비한 성질] The Mystery of Liquids
There are many liquids around us, but this experiment uses four: water, vinegar, alcohol, and cooking oil. Each liquid has special properties. We pour each one into a clear bottle. Then we look at the...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
6
W-125  [지도의 종류와 용도] Exploring Different Types of Maps
Maps help us understand the world, and thematic maps show special topics. A specialty map shows famous local products. It can tell us where good apples grow or where people make fine silk. A road map ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
7
W-120  [액체를 섞어보자] The Magic of Mixing Liquids
Some liquids mix well, and some do not. Water mixes easily with acetone and alcohol. Acetone and alcohol also mix smoothly. Even acetone and cooking oil can mix. When these liquids mix, they form one ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
8
W-123  [전기의 활용방법] Electricity and Devices
Electricity is important for many devices. Some devices, like televisions, get power from an outlet. An outlet gives electricity all the time, so a TV works whenever we need it. But during a blackout,...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
9
W-129  [전구의 원리] Understanding Light Bulbs
There are many kinds of light bulbs. A bulb has a glass outline, a filament, support wires, a cap, and an electrical contact. The filament makes light when electricity goes through it. The cap connect...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
10
W-127  [전기가 흐르는 원리] How Electricity Flows
Electricity moves through different materials. A conductor lets electricity flow easily. Metals like copper and aluminum are good conductors. When electric current moves through a conductor, it can ma...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
11
W-132  [오목렌즈와 볼록렌즈] Concave and Convex Lenses
Lenses help us see objects in different ways. There are two main kinds: concave lenses and convex lenses. A concave lens is thin in the middle. It makes objects look smaller. Even faraway objects look...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
12
W-116  [물질이 녹는과정] Magical Ink and Solutions
Melting is when a solid becomes a liquid. Ice melts into water when heated. Some people think salt melts in water, but it actually dissolves and makes a solution. A solution is a mixture where one sub...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
13
W-118  [천연자원의 중요성] Natural Resources and Their Impact
Coal and limestone are natural resources. Natural resources are materials from nature that people use in daily life. Natural gas is an important resource. People use it to heat buildings and water. Th...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
14
W-119  [공기의 온도변화] The Changing Atmospheric Temperature
Air temperature changes all the time. It changes with distance from the equator and with height above the ground. We can measure it with a mercury thermometer kept in an instrument screen. The warmest...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
15
W-127  [공기의 이동, 바람] The Changing Winds at the Seashore
At the beach, you can feel a gentle wind called a breeze. In the daytime, the wind blows from the sea to the land. This is a sea breeze. The land heats up faster than the ocean, so the air over the sa...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
16
W-120  The Science of Motion and Speed
When you direct a doll play, you can make the doll move forward. You can move the doll forward or move the background backward. If they move in opposite directions, the doll looks like it moves backwa...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
17
W-136  A Wind-Powered Toy Car
A light car can move with wind from your breath or a fan. You can make a small toy car to test this idea. Use light materials for the car body, like an aluminum can, a plastic box, or a plastic bottle...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
18
W-148  Earthquake Safety Measures
An earthquake is a strong natural disaster. It happens when the Earth’s crust moves suddenly, and the ground shakes hard. The shaking can break roads and make buildings collapse. Walls can get big c...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
19
W-125  The Wonders of Rocks
There are different kinds of rocks, and each forms in a special way. Sedimentary rocks form when layers of sediments pile up. They often have layers and sometimes contain fossils. Igneous rocks form f...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
20
W-138  How Do Rainbows Form?
Rainbows appear after rain when sunlight shines through raindrops. A rainbow forms because light bends, or refracts, when it enters a raindrop. The light reflects inside the drop and bends again when ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
21
W-127  Why Do Balloons Pop?
Balloons can pop because of air pressure. When you blow up a balloon, air fills the inside. The air pushes on the balloon walls and makes pressure. The more air you add, the more the balloon stretches...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
22
W-139  Can Sound Travel Without Air?
Sound is something we hear every day. We hear voices, music, and sounds from nature. But sound cannot travel where there is no air. Sound needs a medium, like air, water, or metal, to move. Sound trav...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
23
W-112  Why Is the Sky Blue?
The sky looks blue because of the way sunlight meets the air. Sunlight looks white, but it has many colors. Each color has a different wavelength. When sunlight enters the atmosphere, it hits tiny air...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
24
W-115  Water in Space – A Floating Sphere
In space, water does not flow like on Earth. Without gravity, water does not stay in a cup or fall down. Instead, it forms a round ball. This happens because of surface tension. Surface tension pulls ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
25
W-114  Why Is Glass Transparent?
Glass is special because it is transparent, which means light can pass through it. Glass is made from sand that has tiny silica particles. When sand is heated to a very high temperature, it melts and ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
26
W-119  Why Does the Sun Shine Hot?
The Sun shines and gives off heat because of nuclear fusion. This reaction happens deep inside the Sun, where it is very hot and has strong pressure. The Sun is mostly made of hydrogen gas. In the cor...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
27
W-135  Can You Break an Egg in Space?
On Earth, when you crack an egg, the shell breaks and the egg white and yolk spill out. This happens because of gravity and air pressure. But space is different. In space, there is no air pressure. If...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
28
W-117  Why Does a Phone Vibrate?
A phone vibrates because it has a small vibration motor inside. This motor spins very fast and makes tiny shaking movements. The motor has a small unbalanced weight. When the motor turns, the weight m...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
29
W-123  How Does Water Rise and Become Clouds?
Water in lakes, rivers, and oceans is always moving. It moves through the water cycle. One important part is evaporation. Evaporation happens when water changes into gas. The Sun heats the water, and ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
30
W-118  Does Water Boil in Space?
On Earth, water boils at 100°C because normal air pressure pushes down on it. But space is a vacuum with no air pressure. In a vacuum, water molecules can escape easily, so water can boil at a much l...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
31
W-120  콜라가 톡쏘는 이유는-Why Does Cola Have a Fizzy Taste?
Cola and other fizzy drinks taste sharp and bubbly because they have carbon dioxide gas, or CO₂. This gas is dissolved in water under high pressure. When you open a cola bottle, the pressure is rele...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
32
W-113  [위성이 사라지면?] What Happens If Satellites Disappear
If all satellites suddenly vanished, global chaos would follow. TV signals and GPS would stop. Airplanes, ships, and cars would lose navigation tools. Flights would be grounded, and traffic could stop...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
33
W-139  [냉동 보존의 한계] The Limits of Cryonics
In 1967, James Bedford became the first person to be cryogenically frozen. Cryonics hopes to preserve bodies until future medicine can reverse death. But the body must be frozen without damage. Ice cr...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING
34
W-115  [1초의 기준] How Scientists Defined One Second
In 1967, scientists agreed on a precise way to measure a second. Long ago, people used the night sky to track time. The modern second came from the Gregorian calendar, which said one day is Earth’s ...
E-BOOK K-BOOK VOCA COLC ORDER SPEAKING

© 2025 국어랑 문해교실