2. The five boxes below represent a geologic cross-cut with five layers (A is on top and E is on the bottom). The types of rocks
are listed on the right side. In each box, write the appropriate type of rock and explain the answer in relation to the history of the earth’s atmosphere. Answer:
A Limestone layers
B Banded-iron formations
C Metamorphic rocks with fine grains
D Red beds
E Chert layers
Volcanoes released carbon dioxide, water vapour and nitrogen. This gases formed the earth’s early atmosphere. These gases were released from volcanoes.
because Ultimately, the temperature in an area depends on the amount of the Sun's energy reaching the surface in that area. The amount of solar energy in a given area is greater at the equator than in an equal area at the poles, which is why the equator temperature is warmer than the polar temperatures.
