Geology Section 4.1 Homework: Due Friday, 9/30/11

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Read Section 4.1, pages 70 to 74. Answer the questions that follow.

Link for Question #2: http://home.snc.edu/takamasatakahashi/login/AstroSp10/Animations/Active_Figures/nebular/

Last Name, First Name *

Period *

What is the reason for Earth's magnetic field? *

There is a large bar magnet in the center of the Earth

Moving electric currents of molten iron in Earth's inner core induce a magnetic field

Moving electric currents of molten iron in Earth's outer core induce a magnetic field

Solar wind coming from the Sun creates our magnetic field

Describe the Nebular Hypothesis as seen in the graphic on pages 70-71 and the link above. *

The Earth is a __________________ __________________ because of its __________________. *

perfect sphere, revolution

perfect sphere, rotation

oblate spheroid, rotation

oblate spheroid, revolution

What major pieces of evidence have led us to the nebular hypothesis? *

meteorites that have landed on Earth.

pieces of Mars that have landed on the Earth.

the geologic history of the Grand Canyon.

the formation of the Moon

Use the periodic table on pages 698-699 in your textbook to answer the following. When the Big Bang occurred 13.7 billion years ago, the only element in the Universe was *

Lithium

Iron

Boron

Hydrogen

Helium

Use the periodic table on pages 698-699 in your textbook to answer the following. All of the elements up to atomic # ______________ were formed when super massive stars turn in to a supernova. *

What is the difference between the lithosphere and the asthenosphere? *

An object at the North or South Pole would weigh _________________ than an object at the Equator. *

less

equal to

This question makes no sense. There is no gravity in these places.

Describe the three things that generate Earth's internal heat? *

Assume that the crust temperature increases by 30 degrees Kelvin for each kilometer below Earth's surface, where the temperature at the surface is 300 Kelvin. Remember that 273 degrees Kelvin equals 0 degrees Celsius. Calculate what the temperature would be at Earth's center (radius 6,378 Km) if the rate of increase of temperature were the same below the crust as in it. Compare your result with the actual inner-core temperature. Why is it different? *

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