There was no other way to make phone calls.
Answer:one of the world's largest observatories.
Explanation:Cerro Tololo is located in the northern part of the South American country of Chile, more specifically, in the Coquimbo region of the country. The Cerro Tololo Inter-American Observatory, is part of the United States's National Optical Astronomy Observatory, and it is one of the biggest in the world of this type.
Answer:
on Earth, the main differences in air pressure are caused by differences in temperature. Cool air produces high air pressure and warm air produces low air pressure. Warm air wants to rise. When warm air rises, cool air will move in and replace the warm air, causing wind.
Answer:
As we go down deep into the soil, the soil is made up of layers that are in a horizontal direction. These horizons are called O, A, E, B, C, R layers respectively. Amon these A, B, and C are major layers of the soil. Most minerals are found in "A horizon" of the soil and they are incorporated with the organic matter.
Explanation:
Answer:
On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the oldest unit in the center, the underlying structure is a syncline.
