Science Terminology

4. A measure of how hot or cold something is. It tells you the average amount of energy the particles in a substance have.
9. The tiny, basic building block of all matter. It's the smallest part of an element that still has the properties of that element (like hydrogen or oxygen).
10. Any water that falls from the clouds to the Earth's surface, like rain, snow, sleet, or hail.

1. A group of two or more atoms stuck together
2. How fast something is moving. It's calculated by the distance traveled divided by the time it took.
3. A push or a pull on an object. A force is needed to start, stop, or change the direction of something moving.
5. The thick blanket of gases (like air) that surrounds the Earth. Gravity keeps this layer from floating away into space.
6. The average weather conditions in an area over a very long time, usually 30 years or more. It describes what the weather is usually like there (e.g., a tropical climate is usually hot and rainy).
7. A force that resists (or works against) motion when two objects or surfaces rub against each other. It's why a rolling ball eventually stops.
8. The natural force that pulls everything toward everything else. It's what keeps your feet on the ground and makes apples fall from trees.