wind beneath earths oceans.

the removal of rock particles by wind,water,ice,or gravity.

the study of the moon,stars,and other objects in space

consumers that eat both plants and animals

an image of a distant object caused by a refraction of light.

continually adds new material to the sea floor.

type of weathering in which rock is physically broken into smaller pieces.

the spinning of earth on its axis

break down wastes and dead organisms and return the raw materials to the ecosystem

a curved piece of glass or other transparent material that is used to refract light.

the process by which ocean floor sinks beneath a deep ocean trench and back into mantle.

wedges of ice in rocks widen deepen cracks.

the movement of one object around another

an organism that can make its own food

thicker in the center than at the edges

state that pieces of earths litosphere arm in slow constant motion driven by convection currents in the mantle.

the grinding away of rock by rock particles carried by water,ice,wind,or gravity.

when the sun is farthest north or south of the equator.

an organism that obtains energy by feeding on other organisms

thinner in the center than at the edges

the surface where two plates move apart or diverge.

the process that breaks down rock and other substances at earths surface.

the imaginary line that passes through earths center and the north and south poles.

consists on the many overlapping food chains in an ecosystem

a measure of how much a ray of light bends when it enters that material.