Transcript GEOLOGY UNIT REVIEW

GEOLOGY UNIT REVIEW
By Mrs. Susan Dennison
2012-13
What is a landform?
A landform is a physical feature of the Earth’s
surface.
What is weathering?
Weathering is the process of breaking rock
into soil, sand, or other tiny pieces.
What is erosion?
Erosion is the process of moving sediment
from one place to another.
Why would footprints on the Moon
last for hundreds of years?
There is no wind or water to erode the
footprints!
What is deposition?
Deposition is the process of dropping, or
depositing, sediment in a new location.
Some rivers deposit sediment
in broad areas of their
“mouths,” called deltas. The
Mississippi River delta is one of
the largest in the world.
Sediment was deposited at the
mouth, moved by the flow of
the river.
What is mass movement?
Mass movement is the downhill movement
of rock and soil because of gravity.
How can we describe Earth’s crust?
The Earth’s crust is the outer layer of Earth
and made of solid rock. It is the thinnest
layer.
How can we describe the mantle?
The mantle is the layer of rock below the
Earth’s crust. Just under the crust, it is solid.
It is very hot, and the other part of the
mantle is soft, like melted candy.
How can we describe the core?
The core is Earth’s hottest layer, the center of
the planet. It is composed of an outer core of
liquid (molten) iron and an inner core of solid
iron (metal).
What would be a good model of the
Earth’s layers?
A peach would be a good model of the Earth’s
layers because it has a thin skin and a hard pit
in the center.
If the core is the hottest layer, why is
it still solid?
The core is solid because of the great amount
of pressure at the center of the Earth!
What is a plate?
A plate is a rigid block of crust and upper mantle.
There are 12 major plates on Earth’s surface that fit
together like pieces of a jigsaw puzzle. They “float”
on the soft part of the mantle. As pressure and
heat make the mantle move, the plates move, too.
What does it mean to say that the
Earth’s plates “float” on the mantle?
The plates float on the soft rock of the lower
mantle, which has currents, like water.
Which would be a better model of Earth’s
plates, a tile floor or a stack of dishes?
A tile floor would be better because the plates are
next to one another, not stacked up like dishes.
What is magma?
Magma is molten (liquid) rock from the
Earth’s mantle.
What is a volcano?
A volcano is an opening in Earth’s crust
through which lava flows.
What is an earthquake?
An earthquake is a shaking of the ground
caused by the sudden release of energy in
Earth’s crust.
What is a fault?
A fault is a place where pieces of the Earth’s
crust move. San Andreas fault in California is
known as a major location of quakes.
What is continental drift?
Continental drift is the theory of how Earth’s
continents move over its surface.
What does it mean to say that the
“Atlantic Ocean is getting wider, pushing
Europe and North America apart”?
The North American and European plates are
moving away from each other!
What is Pangea?
Pangea is the theoretical “supercontinent”
that contained all of Earth’s land about 225
million years ago.
What are fossils?
Fossils are the remains or traces of past life
found in the Earth’s crust.
How are mountains formed?
Mountains are formed when two continental
plates pull apart, push together, or slide
against one another.
The Grand Tetons are mountains that were
formed by boundaries of plates pushing
rock upward.
The Himalayas are the world’s tallest
mountains. They were formed by
convergent plate movement.