WorksheetsFinal Exam: Earth's Formation
Total questions: 8
Worksheet time: 2hrs 0mins
Name
Class
Date
1.
An Impact Crater is ______.
a)
Removal of surface material through weathering by agents such as wind and water
b)
Process that occurs when a nucleus decays and emits alpha, beta or gamma radiation
c)
A crater on a planet or moon caused by the impact of a meteorite or other object, typically circular with a raised rim.
d)
Atoms of the same element that differ in the number of neutrons
2.
True or False. Earth’s surface does not illustrate many impact craters whereas Moon’s surface illustrates many impact craters.
a)
True
b)
False
3.
The Earth, unlike the Moon, has few obvious impact craters because _____________.
a)
Few asteroids have struck the Earth
b)
Earth's atmosphere absorbs the kinetic energy of asteroids
c)
Most impacts occur in Antarctica where they are yet to be discovered
d)
Earth is an active and dynamic planet whose surface is constantly undergoing change
4.
The most common type of meteorites discovered on Earth is _____________________.
a)
Chondrites
b)
Iron meteorites
c)
Tektites
d)
Stony meteorites
5.
Earth is protected from most meteorite impacts by ___________________.
a)
U.S. Strategic Meteorite Interception Program (SMIP)
b)
Its gravitational field
c)
Its atmosphere
d)
Solar Wind
6.
Evidence that the depression called Meteor Crater in Arizona was the result of a meteorite impact includes ____________________.
a)
A steep-sided and closed crater
b)
Inverted piles of sedimentary rocks
c)
Surrounding sedimentary layers dipping away from the crater
d)
All are correct
7.
Relatively few impact craters have been discovered on Earth because ________________.
a)
Over 70% of the Earth is covered by oceans.
b)
Weathering and erosion erase them.
c)
All are correct
d)
Some of the crust gets recycled by subduction.
8.
When did the Earth form?
a)
10 billion years ago
b)
4.6 billion years ago
c)
446 million years ago
d)
6,000 years ago
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