Answer:
Radio telescopes, telescopes detecting infrared radiation, gamma rays, and X-rays and space-based telescopes are essential in modern astronomy.
Answer:
The North Atlantic Drift moderates the climate of western Europe so the winters aren't as cold as they are in the same latitude in other countries.
Answer:
While slavery was the major issue separating the North and South, it was not slavery itself that sparked the conflict. The South wanted to secede from the Union, and the North refused. While President Abraham Lincoln personally opposed slavery, he recognized that it was legal under the U.S. Constitution at the time. He also recognized that few in the North were ready to go to war to free the slaves. For Lincoln and the northern majority, preservation of the Union was the foremost goal.
The seismic focus is the point in the earth's crust where an earthquake originates from.
I think the correct answer is B.
