ciencias

Matter and energy on earth

Mater changes:

Earth, like all other things, is made of matter. It has a lot of a mass and large volume.

Matter is made of many different substances (salt, water, wood etc…) these substances may be mixed together.

For example: seawater contains many salts.

Earth’s matter exists in three states:

Solid, like rocks

Gaseous, like air

Liquid, like water

Matter is constantly changing, these changes can be:

· Physical changes: some examples of physical changes of state, movement and fragmentation.

Changes of state are constantly occurring. For example, liquid lava comes out of volcanoes and becomes solid when it reaches the surface.

Earth is constantly moving. It rotates on its axis (rotation) and it orbits the sun (revolution). The matter on earth is also moving. Examples of movement of earth’s matter are:

· Tornadoes

· Oceans

· Water currents

· waterfalls

the movements of air and water break up water.

For example, the movement of waves breaks up rocks, and wind erodes soft rocks like limestone.