Answer:
A.it prevent some UV rays
The seismic wave can tell the scientists about the earth's layers.<span />
Answer:
According to Google, Nunavut has the lowest population density in Canada. This might occur because it's made up of islands and the area is a tundra so it's very cold and doesn't support agriculture. The islands are also accessible only by plane or boat so it's hard for people to move to the area.
Explanation:
The actual weight of the Earth is <span>12,958,069,340,000,000,000,000 Pounds. Hope this helps</span>