Simple, we weren't around during that time, so we made theories and conclusions to when life evolved on earth.
They are mid-ocean ridges<span>, which </span>form<span> where two tectonic plates are spreading apart, which is called seafloor spreading. Tectonic plates are large pieces of the earth's crust, and they interact in a number of ways. Where they pull apart is called a divergent plate boundary.</span>
Answer:
325
Explanation:
The gradutions are by 50. As there is no graduation after 300, it must be 325.
Answer: b. Asteroids can cause great damage if they collide with Earth.
Explanation:
The main idea is that asteroids can cause great damage to earth if they collide with our planet. This is what the entire article was centred around starting with an example of the effects of the last time there was a collision with Earth.
It then goes forward to talk about the chances of being hit by another asteroid and what scientists will do if the Earth is at risk of being hit by one which shows that the whole point of the article is the damage asteroids can cause on earth and why this should be avoided.
Correct Answer: A cultural region is a specific area where the people share one or more unifying cultural elements. Cultural regions are distinct because, for example, their land can range in size from a few to millions square miles. They can establish cultural boundaries as well.
Hopefully, this helps! :D
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