Answer:
1. medieval - relating to a time in European history from about 500 to 1500 A.D.
2. Norse - relating to Scandinavia and its people
3. legacy - anything that is handed down from one generation to the next
4. migration - the act of moving from one place to another
5. Gupta - an empire that lasted about three hundred years in India
6. Tang - Chinese dynasty lasting about three hundred years
Answer:
The correct answer is A. Greenhouse gases allow visible light to pass through and warm the Earth's surface, and prevent heat energy from radiating back out into space.
Explanation:
The greenhouse effect of the gases is due to the fact that they transmit sunlight at a higher frequency than infrared, which heats up soil, trees and water. That heat cannot then radiate into space again like infrared radiation because the greenhouse gases partially absorb it. The effect is that the Earth's temperature rises until a completely new equilibrium temperature is reached. The most significant greenhouse gases are water vapor, carbon dioxide, methane, and tropospheric ozone.
The concentration of greenhouse gases in the atmosphere is constantly increasing at an accelerating rate due to human activities. The annual growth rate is currently two millionths of a year.
It's important because it helps to transport crops and other products for trade.
The correct answer is a,b and c.
a) its core becomes a white dwarf.
b) its outer layers form a nebula , or vast cloud of gas and dust.
c)its outer layers expand , and the star becomes a red giant.
North Africa has three main geographic features: the Sahara desert in the south, the Atlas Mountains in the west, and the Nile River and delta in the east. The Atlas Mountains extend across much of northern Algeria, Morocco and Tunisia.
