The crust, mantle, and core are all part of the
a. atmosphere.
b. biosphere.
c. hydrosphere.
d. geosphere.

the study of the earth's magnetic field is known as
a. paleomagnetism.
b. isochronism.
c. topography.
d. geology.

The correct answer for 1 is D. geosphere. Geosphere is the solid part of the of the universe, often confused with litosphere but the litosphere is just on the top. Hydrosphere is all the water on the world, while atmosphere is all the air. Biosphere is all the living beings. The answer for 2 is A. paleomagnetism. Geology is the science of the earth, topography is how things on earth are physically arranged on earth, while isochronism is when something is equal in duration to something else.