In the paleotmosphere, water vapor <span>was able to condense to form clouds and rain because the earth's surface cooled as there were fewer meteorite impacts.
answer=water vapour
hope this helps....</span>
Answer: The Precambrian Era comprises all of geologic time prior to 600 million years ago.
Explanation: The Precambrian was originally defined as the era that existed before the emergence of life in the Cambrian Period. It is known that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time.
Answer:
8. B. we see comets when they approach the sun.
9. A. the sun's surface.
Answer:
For the countour part: Map c, contour is 50m (the lines increases/decreases with 50 meters each step). Map b, need to see the whole map to decide.
Mars has 7 natural resources
