Exam 1: The Earth in Context

The lithosphere is composed of the ____________.

The thickness of Earth's crust varies from ____________.

The stream of charged particles given off by the Sun,which prevented the accumulation of hydrogen and helium during the formation of the terrestrial planets,is called ____________.

In the heliocentric model ____________.

As compared to the asthenosphere,the lithosphere is ____________.

A fracture in the crust,where rocks slide past one another,is termed a ____________.

The circumference of Earth is most nearly ____________.

Which of Earth's layers has the greatest density?

Differentiation of the core from the mantle early in Earth's history was possible because the planet was ____________ at the time.

Aside from Earth,the terrestrial planets are ____________.

In our current understanding of the big bang,____________.

As the Universe has evolved,____________.

As compared to continental crust,the rocks that make up oceanic crust are ____________.

In agreement with the Big Bang theory,our Universe is ____________.

All objects in the Solar System are in orbit around ____________.

The boundary between the crust and mantle is marked by a seismic-velocity discontinuity called ____________.

Moving into the interior of Earth,temperature ____________.

The lithosphere lies directly above the ____________.

Our Sun belongs to a galaxy known as ____________.

Atoms that are heavier than iron are generally produced by ____________.