4.2

3. To sort things into groups based on how they are alike, like putting all the mammals in one group and reptiles in another.
4. The invisible rubbing force that slows down moving objects when they slide against each other, like sledding on grass instead of snow.
7. A short group of words that belong together but do not make a complete sentence on their own (like "down the street").
9. The amount of electrical force or "push" that moves an electric current through a wire.
14. The striking of one thing against another, like a meteor hitting the earth; or, a powerful effect or change on something.
15. A type of battery that you don't throw away; you can plug it into the wall to fill it with power again.

1. To use details and adjectives to paint a picture with words so someone else can imagine it.
2. A step-by-step list of instructions you must follow in order to do something correctly, like a recipe or a science experiment.
5. To grab and hold something flying through the air; or, a hidden trick or difficulty in a plan.
6. A personal belief or feeling about something that cannot be proven true or false, like "chocolate is the best ice cream flavor."
8. Completely dark, without a single speck of light to see by.
10. A type of natural energy that never runs out because nature makes more of it, like wind or sunlight.
11. To give a short overview of a story, telling just the most important parts in your own words.
12. How something is built, arranged, or put together (like the bones in a skeleton or the walls of a house).
13. A group of words that does contain a subject and a predicate action (like "because the dog barked").