If greenhouse gases in the atmosphere act like a blanket around the earth, how is this "blanket” being changed by human activities? 1. it is getting thinner and keeping the earth cooler. 2. it is getting thicker and keeping the earth cooler. 3. it is getting thicker and keeping the earth warmer. 4. it is getting thinner and keeping the earth warmer.

4. It is getting thinner and keeping the Earth warmer.

Explanation:

The greenhouse effect is a natural phenomena in which the abundance of greenhouse gases increases into the atmosphere. This occurs due to deforestation, volcanic eruption, forests fires and burning of the fossil fuels. The greenhouse gases like carbon dioxide, carbon monoxide, methane, nitrous oxides and others are added up into the atmosphere. These gases are diatomic in nature they are capable of absorbing the heat energy from the sun. This will lead to the increase in the global temperatures.

The higher atmospheric layer- stratosphere exhibit a thick layer of ozone because of these gases and high atmospheric temperature the layer cover is getting thinner. The function of the layer is to protect the earth from incident rays of ultraviolet and infrared radiations coming from the sun but as the layer is getting thinner the rays are entering the atmosphere. This is making the earth warm.

answer; polycythemia is the correct answer;

a. the production of carbon dioxide through the process of photosynthesis