How many eons are in the geologic time scale?
A. 4
B. 2
C. 3
D. 5
Answer: C
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This method allows geologists to match rock units across large areas even when some rock units are missing.
- Cross cutting relations
- Fossil correlation
- Original horizontality
- Superposition
- Unconformity
In subduction zones, magma formation takes place typically due to:
a) melting of the subducting plate as a result of frictional heating b) increased pressure from plates colliding c) pressure being reduced (decompression melting) d) water being released under pressure which lowers the melting temperature of the overlying asthenosphere e) hot spots, which always occur along subduction zones
Air masses that form over northern Siberia are most likely to be ________ air masses
Fill in the blank(s) with the appropriate word(s).
Genetically modified crops are created by inserting genetic material from one species into another.
Answer the following statement true (T) or false (F)