Untitled

2. The term for a substance made up of only one type of atom
4. The main gas responsible for greenhouse effect.
6. The device that converts electrical energy into mechanical energy.
7. The branch of science dealing with the behavior of light.
10. The type of rock formed from cooled molten lava.
13. The smallest structural unit of a compound.
16. The chemical reaction in which an acid and base react to form a salt and water.
18. The name of the scientist who proposed the laws of motion.
19. The energy stored in an object due to its position or configuration.
20. The natural environment of a plant or animal.
23. The energy stored in an object due to its position or configuration.
26. The gas essential for aerobic respiration in animals.
27. The organ system responsible for detoxification in the human body.

1. The outermost layer of a plant cell.
3. The process by which liquid turns to gas at the surface.
5. The unit of electric current.
8. The device used to measure atmospheric pressure.
9. The phase change from solid directly to gas.
11. The process responsible for breaking down glucose to release energy in cells.
12. The component of blood responsible for clotting.
14. The part of a plant that anchors it and absorbs water.
15. The species of particle that orbits the nucleus in an atom.
17. The point inside the Earth where an earthquake originates.
18. The term for animals active during the night.
19. The measure of the amount of matter in an object.
21. The layer of gases surrounding the Earth.
22. The layer of Earth that lies just below the crust.
24. the state of matter with definite volume but no definite shape.
25. The type of bond formed by sharing electrons between atoms.