Which of the following is not a natural cause for global climate change?
A) Changes in solar input
B) Increase in elevation
C) Tectonic plate movement
D) Variation in the Earth's orbit
E) Volcanic activity
B
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If participating nations continue to follow the Montreal Protocol recommendations, ozone levels should return to 1980 levels by the year 2071
Indicate whether the statement is true or false
Which feature on this diagram is a tarn?
A) 1, the circular depression at the head of the valley
B) 2, a lake in the upper valley
C) 3, a steep ridge
D) 4, a valley that is above the level of the main valley
The process of herding and domesticating aquatic animals is known as
A) aquaculture. B) agriculture. C) processing. D) artisanal fishing.
Ozone absorbs ultraviolet radiation in the troposphere.
Answer the following statement true (T) or false (F)