________ is a measure of the volume of open space in rocks and unconsolidated, geologic materials like alluvium and soils
A) Porosity
B) Angularity
C) Permeability
D) Sphericity
Answer: A
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Which of the following are not differences between an eruption column and pyroclastic flow?
A) Tephra in an eruption column mostly cools before it reaches the ground. B) A pyroclastic flow mostly flows downhill, whereas a column rises at first. C) Damage from an eruption column can be more widespread. D) Pyroclastic flows form from a higher gas flux.
Which of the following are differences between an eruption column and pyroclastic flow?
A) Tephra in an eruption column stays hotter until it reaches the ground. B) A pyroclastic flow rises higher into the atmosphere than an eruption column. C) Damage from an eruption column is more restricted than a pyroclastic flow. D) A pyroclastic flow forms when the gas flux cannot support the column.
Which of the following is a weakness of the Paris Agreement?
A. Most countries are not making commitments. B. For countries to meet their commitments they will need to spend huge amounts of money to improve energy efficiency. C. The goal of keeping global temperature to no more than 2°C will cause many countries to withdraw from the agreement. D. All of these are correct statements.
An overall average rate of soil formation might be about ____ per century
A)2.5 cm B)25 cm C)2.5 m D)25 m E)250 m