Question

1. choose all that apply.

choose three main layers of the earth.
crust
nucleus
shell
core
mantle
mainstream

1. choose all that apply.

choose three facts about the earths crust.
the lower crusts temperature drops to about -50 °c.
the depth varies from 6 km on the ocean floor to 48 km on land.
the crust can reach temperatures of 700 °c.
the crust is broken into about 20 large pieces, or plates.
the crust is the thickest layer of the earth.
much like swiss cheese, the crust has many empty spaces.

Explanation:

For the first question, the Earth's main layers are crust, mantle, and core. The nucleus is part of an atom, shell is a general term not specific to Earth's layers, and mainstream is unrelated. For the second question, the crust's depth varies (6 - 48 km), can reach 700°C (lower crust), and is broken into about 20 plates. The lower crust's temp doesn't drop to - 50°C (too cold), the crust is not the thickest layer (mantle is thicker), and it doesn't have Swiss - cheese - like empty spaces.

Answer:

1. crust, core, mantle
2. The depth varies from 6 km on the ocean floor to 48 km on land., The crust can reach temperatures of 700°C., The crust is broken into about 20 large pieces, or plates.