As recycling and composting efforts have grown, what has occurred with the annual amount of waste sent to landfills?
A. it has stayed the same
B. it has proportionally increased
C. it has proportionally decreased
D. it has disproportionally increased
Answer: C. it has proportionally decreased
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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.
The Permian extinction killed approximately ____ of all marine invertebrate species
a. 54% b. 66% c. 70% d. 83% e. 96%
All places on Earth experience the same daylength on or about March 21
Indicate whether the statement is true or false
Striations and grooves in bedrock indicate the direction of ice movement.
Answer the following statement true (T) or false (F)