How old is the Earth?
A. about 4.6 million years old
B. about 4.6 billion years old
C. about 4,600 years old
Answer: B
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Which of the following terms refers to the percentage of water vapour present in the air compared to that required for saturation?
A. relative humidity B. mixing ratio C. absolute humidity D. dew point
?Throughout the earth's history, landmasses have split apart and joined together as tectonic plates shifted.
Answer the following statement true (T) or false (F)
The greatest threat to global biodiversity is ________
A) habitat destruction B) chemical pollution C) overconsumption of rice, corn, and wheat D) the introduction of alien species
Mid-oceanic ridges are often marked by lines of ________ that carry and precipitate metals.
A. ocean trenches B. submarine volcanoes C. ocean currents D. hot springs E. seismic ridges