Answer: lithosphere Why? The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.
<span>Virginia Coastal Plain.
In addition to the rich fossil finds mentioned, these rocks also include some mastodon fossils which can be found in Quaternary sediments deposited along lakes and rivers.</span>
