Author Question: Over the span of 70 million years, Earth's climate A) was much cooler in the distant past than ... (Read 69 times)

lindiwe · **on:** Jul 14, 2018

Over the span of 70 million years, Earth's climate

A) was much cooler in the distant past than the present.
B) has remained fairly constant, only showing a warming trend during the past 200 years.
C) was much warmer in the distant past than the present.
D) was warmest approximately 10 million years ago and coolest about 56 million years ago.

Question 2

In 1974, Dr. Rowland and Dr. Molina made what observation regarding ozone (O3)?

A) Ground-level O3 irritates human eyes and respiratory systems.
B) Anthropogenic O3 releases were a major culprit in global warming.
C) The photochemical interactions of chlorofluorocarbons and O3.
D) Automobile exhaust and sunlight were producing photochemical smog.