Earth Environmental Science Unit 1

5. A big ball of hot gas that gives off light and heat, like the Sun.
6. The simplest and most common element in the universe.
9. How long it takes for something to finish a cycle, like one trip around the Sun.
10. The idea that our solar system formed from a big cloud of gas and dust.
11. When tiny atoms smash together to make bigger ones and release energy—how stars shine.
12. Changes in weather and daylight caused by Earth’s tilt and orbit.
15. Rules that explain how planets move around the Sun.
16. A type of sunlight that can cause sunburn.
17. What the air is like right now—rainy, sunny, windy, etc.
19. The layer of gases around Earth that we breathe and that protects us.
21. Another name for gas giants—big planets made mostly of gas.
22. When the ocean is at its highest level.
24. When something goes around another object, like Earth going around the Sun.
25. The part of light we can see—like colors of the rainbow.
28. Heat energy we can’t see but can feel.
29. How plants make food using sunlight, water, and carbon dioxide.
30. Earth is sloped a little, which causes seasons.
31. Extra high and low tides that happen when the Sun, Moon, and Earth line up.

1. Rocky planets like Earth and Mars.
2. An invisible line that Earth spins around.
3. Less extreme tides that happen when the Sun and Moon are at right angles.
4. When the ocean is at its lowest level.
7. All types of energy waves, like light, radio waves, and X-rays.
8. When something spins around, like Earth turning once every day.
10. The center of the Sun where energy is made through nuclear fusion.
13. The Sun and everything that moves around it—planets, moons, asteroids, and more.
14. The rise and fall of ocean water caused by the Moon’s gravity.
18. The path something takes as it goes around another object, like Earth going around the Sun.
20. A super hot reaction that makes energy in stars.
22. A light gas made when hydrogen atoms fuse together in stars.
23. The usual weather in a place over a long time.
26. When warm stuff rises and cool stuff sinks, moving heat around.
27. All the places on Earth where life exists—land, water, and air.