World War 2 occurred in the late 40's, so this is most likely why there is a dip in that age group.
Answer:
When the sun shines on earth, the sunlight warms up the earth, in the way that sunlight would warm up a greenhouse. At night, when there is no sunlight, the earth cools down, just like a greenhouse. When cooling down, the earth keeps some of the warmth trapped in the atmosphere- just like how a greenhouse would.
economic activities such as industrialization and manufacturing have caused and put a lot of smog into our air which then makes it way back down to the bottom of the ocean or ground
The most logical answer sounds like D.
If it grows underwater then of course it's able to withstand water. <span />
The correct answer is D. gross national product. (I took the test)
