Point A is located 7600 kilometers from the epicenter of this earthquake. How many minutes did it take the first S-wave to reach point A? * 1 point 9 mins
11 mins
15 mins
20 mins

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Witch layer of the atmosphere has the most air pressure