Unit 1
About 78% of the atmosphere is made up of it
What is nitrogen
states that geologic processes that happened in the past can be explained by current geologic processes
What is uniformatarianism
A substance made up of two or more elements
What is a compound
the tendancy of a mineral to split along specific plains of weakness to from smooth flat surfaces
What is cleavage
What is sediment
A fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment
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What are trace fossils
The way a surface reflects light
What is luster
The kind of movement of material due to differences in density
What is convection
A rapid movement of a large mass of mud
What is a mud flow
Animal dung that is used as a trace fossil
What are coprilites
A minerals resistance to being scratched
What is hardness
The theory that describes large scale movements of Earths lithosphere
What are plate tectonics
Rapid mass movement tend to happen more on these
What are steep slopes
Scientist drill down into ice caps to collect a long cylinder of ice
What are ice cores
This rock is named according to the size and type of fragments they contain
What is sedimentary rock
They are very likely to form at a convergent boundary
What are mountains
The very first step in soil formation is the weathering of this
What is the parent rock
The time needed for half of a sample of a radioactive substance to undergo radioactive decay
What is Half-life
The sinking of regions of the crust to lower elevations
What is a subsidance
This rock is often called volcanic glass
What is obsidian