Location and Orbit
Surface to Core
References & Links
Copyright © 2000 by Gary Chan and Matthew McDermott. All rights reserved.
- 1) Earth is a superior or inferior planet?
D) It is a matter of opinion.
- 2) Earthís orbit about the Sun
A) is very elliptical.
B) is almost perfectly circular.
C) takes exactly 365 days.
D) breaks the sound barrier.
- 3) What keeps the gases in the atmosphere from escaping into outer space?
A) ionization of the atmosphere by the Sun.
B) magnetic field of the Earth.
C) winds in the atmosphere.
D) gravitational pull of the Earth.
- 4) From top to bottom, name the layers of the atmosphere.
A) thermosphere, stratosphere, mesosphere, troposphere.
B) troposphere, mesosphere, stratosphere, thermosphere.
C) thermosphere, mesosphere, stratosphere, troposphere.
D) mesosphere, stratosphere, thermosphere, troposphere.
- 5) Why does the air in the stratosphere layer get hotter as height increases?
A) Convection currents from the troposphere, heat the stratosphere.
B) The stratosphere is heated due to the high concentration of carbon dioxide in the air.
C) The ozone layer absorbs some radiation from the Sun, thus heating the stratosphere.
D) It doesnít; the stratosphere gets colder as height increases.
- 6) The upper mantle is separated from the crust and lower mantle by what?
A) the asthenosphere and Moho, respectively.
B) the outer core and inner core, respectively.
C) the simitic and sialic layers, respectively.
D) the Moho and asthenosphere, respectively.
- 7) What do scientists believe are the cause of Earthís magnetic field?
A) large sources of magnetite found in the glaciers in the North and South poles.
B) It is a result of the strong gravitational field of the Earth.
C) motions of ions within the planetís liquid core.
D) the iron in the highly-packed, central core of the Earth.
- 8) When was plate tectonic theory formulated?
- 9) Due to plate tectonics, the underwater mountain ridges are what?
A) spreading out at 2.5 cm per year.
B) closing in at 2.5 cm per year.
C) spreading out at 1 cm per year.
D) closing in at 1 cm per year.
- 10) The gravitational pull of the Moon is approximately what fraction of the gravitational pull of the Earth?