crust, mantle, core
Geologists divide the interior of the earth into 3 major sections...What are they?
The rocks of the crust are covered by a thin layer of soil and a thick layer of sand and mineral fragments called this?
In some places, this sedimentary covering has been worn away, or_________, so that the actual rock of the earth's crust can be seen.
120 degrees Fahrenheit.
2 1/2 miles beneath the earth's surface, the temperature of the rocks is over?
900 degrees Fahrenheit
AT the bottom of the earth's crust 20-25 miles beneath our feet, the rocks are hotter than what?
The mantle is about 1800 miles thick and makes up the _____________ portion of the earth's interior.
Moho is named after the Croatian geologist who discovered it. What does Moho stand for?
hotter and hotter
If you could descend through the earth's mantle, you would find that the temperature continued to grow ___________ and ____________as you traveled deeper.
900-4000 degrees Fahrenheit
The temperature of the mantle rocks rises from about _________ at the top of the mantle to nearly ________at the bottom. This is hot enough to melt steel.
The core extends from the bottom of the mantle all the way to the center of the earth, ___________ miles beneath our feet.
Circulating ___________ _____________ in the liquid metal of the outer core generate the earth's magnetic field.
The __________ __________ is a mass of even hotter metal, but it remains solid instead of a liquid because of the much greater pressure upon it.
New soil is formed by ___________, a process that causes rocks to gradually break or crumble into smaller pieces.
___________ ___________ occurs when natural acids slowly eat into a rock and break it apart.
oxygen and carbon dioxide
Natural acids are produced when rainwater mixes with ________ and ____________ __________ gases in the air.
______________ ____________ takes place when rock is broken down by water, ice, or windblown sand.
Most geologists believe that the earth's crust does not consist of one huge, unbroken shell of rock, but of several individual __________ that "float" like rafts on the soft rock of the upper mantle.
Careful measurements show that some of the earth's plates are drifting as much as __________ ___________ per year.
North American plate
Most of the United States is located on the ___________ _____________ _________, except for the southwestern California.
Indo-Australian and Eurasian
The Himalayas, the highest mountains on Earth, lie on the boundary between the _________________ plate and the ___________ plate.
The earth's oceans contain underwater mountain ranges called _____________ ____________ where plates of the earth's crust are moving away from each other.
As these plates move apart, they create a gap, or _____, between them that is quickly filled by molten rock rising from below, forming a ridge.
When one plate goes under another plate. When this happens, a deep __________, like a muddy valley, is formed in the ocean floor.