From where does the name “greenstone” in greenstone belts originate?
a. Greenstone belts formed on land.
b. Many of the minerals in greenstone belts are green.
c. Greenstone belts contain the earliest algal fossils.
d. The origins of greenstone belts were first described by the geologist Nathaniel Greene.
e. The type locality for greenstone belts is in Greenland
b
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Erosion can result in a vicious cycle of worsening erosion because ________
A) rainwater increasingly soaks into the ground B) plants are less likely to grow in eroded soil C) greater weathering of parent material will occur D) the pH of the soil increases as erosion continues E) the accumulation of humus makes erosion more likely
Clear nighttime skies lead to reduced concentrations of pollutants
Indicate whether the statement is true or false
Which of the following is a member of the Phylum Cnidaria?
A) Copepod B) Jellyfish C) Nautilus D) Salp E) Sea gooseberry
Atmospheric shortwaves usually move ____ longwaves, and ____ when they move through a longwave ridge
a. faster than; weaken b. faster than; strengthen c. slower than; weaken d. slower than; strengthen e. at the same speed as; weaken