UCSB Science Line
Sponge Spicules Nerve Cells Galaxy Abalone Shell Nickel Succinate X-ray Lens Lupine
UCSB Science Line
Home
How it Works
Ask a Question
Search Topics
Webcasts
Our Scientists
Science Links
Contact Information
What percentage of Earth are rocks, compared to soil and water?
Answer 1:

Well it depends on depth. Below a level of just a few tens of meters (if that) there is no soil...its all rock.

At the surface though its different about 70% of earth is covered by water...the rest is land surface... there is a thin layer of soil, which is pretty much decomposed rock) in most places. But the soil is missing in some areas such as steep regions and in other places such as high mountains.

Inmost regions there usually is a thin covering of soil... this may only be inches to several feet deep... in some places such as flood plains it will be deeper.

You may want to get a good physical geology book from the library and begin reading it. It will go into some details and explain how soils form and other aspects of physical geology.


Answer 2:

The Earth is almost entirely rock, more than 99%, assuming that you include the Earth's metal core as a kind of rock (which amounts to about half of the Earth's mass).



Click Here to return to the search form.

University of California, Santa Barbara Materials Research Laboratory National Science Foundation
This program is co-sponsored by the National Science Foundation and UCSB School-University Partnerships
Copyright © 2015 The Regents of the University of California,
All Rights Reserved.
UCSB Terms of Use