The increase in the average atmospheric temperature for the entire planet Earth over the last few centuries can be explained by the
A) greenhouse effect
B) increase in size of gaps in the ionosphere
C) melting of the polar icecaps
D) change in the average salt levels in the oceans

Question

Quizplus · Accepted Answer

The increase in the average atmospheric temperature for the entire planet Earth over the last few centuries can be explained by the greenhouse effect, which is caused by the increased levels of greenhouse gases such as carbon dioxide, methane, and water vapor in the atmosphere. These gases trap heat from the sun and prevent it from escaping into space, leading to a warming of the Earth's surface. The melting of the polar icecaps and changes in ocean salinity are both consequences of the greenhouse effect, rather than causes of it. The increase in size of gaps in the ionosphere is not related to the Earth's atmospheric temperature.

The Increase in the Average Atmospheric Temperature for the Entire