Science — Cells and Body Systems + 6 more topics

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There are many forms of energy, but they generally fall into two main categories:

• Kinetic Energy: This is the energy of motion. If something is moving, it has kinetic energy. The faster an object moves and the more mass it has, the more kinetic energy it possesses.
  • Example: A rolling ball, a car driving, an electron moving in a circuit.

The rock cycle describes the formation, breakdown, and reformation of rocks as a result of sedimentary, igneous, and metamorphic processes. There are three main types of rock:

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Here are some key areas and their contemporary issues:

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Common examples include:
* Changes of state: Melting (solid to liquid), freezing (liquid to solid), boiling (liquid to gas), condensation (gas to liquid), sublimation (solid to gas), deposition (gas to solid). Water turning into ice is still H₂O, just in a different state.
* Changing shape or size: Cutting paper, crushing a can, bending a metal wire.
* Dissolving: When sugar dissolves in water, it's still sugar and water, just mixed together. You could evaporate the water and get the sugar back.
* Mixing: Sand and salt mixed together are still sand and salt.