The period of Earth history before 4 billion years (4000 m.y.):
a. Archean d. Paleoarchean
b. Eoarchean e. Proterozoic
c. Hadean
C
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The first Earth Day was held on April 20, 1990.
Answer the following statement true (T) or false (F)
Chief among the mineral deposits in Europe is ________________, which is found in Sweden, France, and Ukraine.
-bauxite -nickel -copper -dolomite -iron ore
Which of the following climatic regions probably has the largest daily temperature range?
A. east coast marine climate B. arid climate C. tropical wet climate D. Mediterranean climate
About 10% of a large forest experienced a severe fire that burned all but the largest trees. Soon after the fire, the landowner consulted biologists to ask what should be done to the burned region
The biologists explained that if the landowner does nothing, the A) rainfall will likely lead to a severe erosion problem. B) same region will soon be expected to catch on fire again. C) region will naturally recover and eventually become forest again. D) opening will likely be repopulated with invasive species, not native to the region.