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Earth's Past and It's Crust.

Across
The time it takes for half of a radioactive element to change into a different element.
One method of determining absolute age.
Water with no salt in it.
A type of mechanical weathering.
Human activity has added to the number and size of________.
By studying the present, people can learn about the past.
Older rock layers are on the bottom.
The numeric age.
Uses the most water in most homes in the U.S.
How long ago something died.
Part of the water cycle.
Down
Where the mouth of a stream or river enters a large body of water. Has a triangle shape.
The remains of animals or plants that lived a long time ago.
Rocks or anything rubbing against other rocks.
The movement of rock or soil material to a new location.
Caused by acid rain.
Could be the cause of future conflicts between nations.
Uses radioactive decay to measure absolute age.
Part of the water cycle where water vapor changes into rain.
The physical breakdown of rocks on the Earth's surface.