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29 Cards in this Set

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How was the moon created?
There are 4 theories, but the one that is most plausable is collision-ejection theory. Something collided on earth and it send a chunk of the earth into space, now the moon.
What is the Earth's atmosphere made out of?
4/5ths nitrogen
1/5th oxygen
What are the 4 layers of the atmosphere
Ozone molecules in the ___________ absorb UV rays.
The outermost layer, or ______, of the Earth offers clues to the history of our planet.
The Earth's surface is divided into huge plates that move over the ________ _________. Movements of these plates, a process called plate _________, are caused by convection in the mantle, and upwelling of molten material along cracks in the ocean floor produces seafloor spreading.
upper mantle.
__________ _________ is responsible for most of the major features of the Earth's surface, including mountain ranges, volcanoes, and the shapes of the continents and oceans.
Plate tectonics
Study of _________ waves (vibrations produced by earthquakes) shows that the Earth has a small, solid inner core surrounded by a liquid outer core.
The _______ core is surrounded by the dense mantle, which in turn is surrounded by the thin, low-density crust.
What is Earth inner and outer core primarily made of?
Iron w/little bit of nickel
What is the Earth's mantle made out of?
iron-rich minerals
The Earth's magnetic field produces a _________ that surrounds the planet and blocks the solar wind.
Some charged particles from the solar wind are trapped in two huge, doughnut-shaped rings called the ______________ __________ ____. A deluge of particles from a coronal mass ejection by the Sun can initiate an __________ display.
Van Allen Belt
The ______ has light-colored, heavily ratered highlands and dark-colored, smooth-surfaced maria.
Many lunar rock samples are solidified lava formed largely of minerals also found in _______ rocks
___________ rock in the lunar highlands was formed btwn 4.0 and 4.3 billion years ago, whereas the ______ ________ solidified btwn 3.1 and 3.8 billions years ago. The Moon's surface has undergone very little geological change over the past 3 billion years.
Mare basalts
Impacts have been the only significant "weathering" agent on the moon; the Moon's _________ (pulverized rock layer) was formed by meteoritic action.
Did the Lunar rocks that the astronauts brought have any water or volitile nutrients in them?
________ _______ may have been discovered at the moon's poles.
Frozen water
The ______________ theory of the moon's origin, accepted by most astronomers, holds that the young Earth was struck by a huge asteroid, and debris from this collision coalesced to form the Moon.
The moon was ______ in its early stages, and the anorthositic crust solidified from low-density magma that floated to the ______ surface. The _______ _______ were created later by the impact of planetesimals and were then filled with lava from the lunar interior.


mare basins
___________ and __________ interactions btwn the Earth and the moon produce tides in the oceans of the earth and set the moon in synchronus rotation. The moon is moving away from the earth, and consequently, the Earth's rotation rate is decreasing.
Gravitional and Centrifugal
Can the Earth's ozone layer, which is now being depleted, be naturally replenished?
Yes, the ozone is created continuously from normal oxygen molecules by their interation with the Sun's UV rays.
Who was the 1st person to walk on the moon and when?
Neil Armstrong
July 20th 1969
Do we see all parts of the Moon's surface at some time throughout the lunar cycle of phases?
No. We never see the far side of the moon, b/c its rotation is synchronus with ours.
What causes the ocean tides?
The tides are created by orbital and gravitational forces, primarily from the Moon and , to a lesser estent, from the Sun.
When does the spring tide occur?
Spring tides occur 2 times a month. On a full moon and new moon.
Why does the Earth's albedo change daily? seasonally?
B/c it depends on the weather. If its cloudy, your not going to get the same albedo if it were sunny. Because we move closer and farther from the sun.
Why is the Earth's atmosphere not riddled with craters as is that of the moon?
B/c we have a magnetic field???