Across
- 2. - The variety of life in the world or in a particular habitat or ecosystem.
- 3. - The whole of all matter, energy, planets, stars, and space.
- 4. - Albert Einstein’s famous theory that revolutionized our understanding of space and time.
- 6. - A minute portion of matter, such as an atom, molecule, or subatomic component.
- 10. - The rate at which an object changes its velocity over time.
- 12. - A proposed explanation made on the basis of limited evidence as a starting point for further investigation.
- 13. - A space entirely devoid of matter, such as the environment of outer space.
- 14. - The basic building block of matter, consisting of a nucleus and surrounding electrons.
- 15. - A precious, yellow metal known by the chemical symbol Au.
Down
- 1. - The type of force that attracts any two objects with mass toward each other.
- 5. - A localized physical response to injury or infection characterized by redness, heat, and swelling.
- 7. - A group of living organisms consisting of similar individuals capable of exchanging genes.
- 8. - The act or practice of stopping something from happening or arising.
- 9. - An optical instrument used to make distant objects in space appear closer and clearer.
- 11. - Capable of catching fire and burning easily.