Science madness

3. Cycle (two words), The cycle describing the movement of water on, above, and below Earth's surface.
4. Power (two words), The type of energy harnessed from the sun.
5. A substance made of two or more elements chemically combined.
7. The vertical columns in the periodic table.
8. The organ responsible for pumping blood in the human body.
9. A group of organisms capable of interbreeding and producing fertile offspring.
12. A reaction that releases heat.
14. Materials that do not allow electricity to flow through them.
15. Rocks formed from cooled magma or lava.
17. The process by which plants make their food using sunlight.
18. The powerhouse of the cell.

1. The rate of doing work or transferring energy.
2. The layer of gases surrounding Earth.
5. Green pigment found in plants that absorbs light energy for photosynthesis.Atom, The smallest unit of an element.
6. This gas is released during photosynthesis.
10. The change of state from a liquid to a gas.
11. The unit of force.
13. A break in Earth's crust where rocks move.
16. The force that pulls objects toward the center of the Earth.