Planet Earth Chapter 2 Quiz

Approximately how much of the Earth's surface is covered by ocean? What is the average depth of the ocean?

70%, 4.5-5.0 km

What is the basis for defining boundaries between the following layers: crust, mantle and core?

Chemical differences (differences in composition)

The Earth Produces a _______________ that shields the planet from _______________

Magnetic Field/solar wind

The dominant gas in the atmosphere is ___________. The density of the atmosphere __________ with increasing elevation.

Nitrogen/Decreases

Is temperature the same everywhere inside the Earth?

No, the temperature of the Earth increases with increasing depth

What is the basis for defining boundaries between the following layers: lithosphere and asthenosphere?

Physical differences (differences in physical properties or behavior?

Which of the following statements is FALSE? A. The mantle is composed almost entirely of solid rock B. The crust floats in a subterranean "sea" of magma C. The mantle is composed of rock, whereas the core is composed of metal D. The outer core is liquid and the inner core is solid

The crust floats in a subterranean "sea" of magma

Which of the following statements about the Earth's density is correct?

The density of the Earth increases with depth, but the rate of increase is not constant: the core of the Earth is much denser