What is planetary geologists?
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what's the difference between 'soft' rock and 'hard' rock geology?
What is lava?
Explain the process of fossil formation?
How do minerals become rocks and rocks become soil?
How were sedimentary rocks created?
What time period can carbon-14 dates have?
What is the difference between a semi-precious and a precious stone?
Explain how are the layers of schist separated into alternating light and dark minerals?
What is 'geologic time'?
What is pyrite?
Describe the formation of igneous rocks?
What is waste?