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Why do seismic waves speed up beneath the surface of continents?
Because earths crust is denser than the mantle
What is the earths under crust surrounded by?
Earths under crust surrounded by Upper Mantle (35-60 km) .The mantle is composed of sillicate rocks that are rich in iron and magnesium relative to the overlying crust.
Did the upper mantle or core of earths surface drive the plate tectonics?
The mantle, being of a silly-putty-like consistancy, is responsible for the movement of the plates on earth's crust, or plate tectonics.
What does rocks in earths mantle contain a higher percentage of what than rocks in earths crust?
iron and magnesium
Is it true that earths crust contains most of earths mass?
No. The crust contains a small fraction of earth's mass. Most of the mass is contained in the mantle.
What is under the earths surface and in the earths crust?
mantle
What is the rigid layer of the earths surface that is made up of the crust and a part of the upper mantle?
It's called the lithosphere.
What is also called the earths crust?
The mantal
The layer of rock between earths crust and core?
its called the mantle
Why does water float on Earth's surface?
Oceanic crust is denser than continental crust, it floats lower in earths mantle.
What is earths top surface?
It is called the crust.
What is the layer below the earths crust called?
the mantle then the outer core then the inner core
Rigid layer of earths surface made up of the crust and a part of the upper mantle?
lithosphere
Does a volcano form when magma reaches earths surface?
That is correct. When magma travels from the mantle to the crust and reaches the surface, that is a volcano.
Is the asthenosphere the thinnest layer?
No. The mantle is below the crust (what we live on), which is the thinnest layer of the earth.
Is the earths surface also called the crust?
Yes
What is the largest layer of earths surface?
The largest layer of Earth's surface is the crust, which is divided into oceanic and continental crust. The continental crust is thicker and less dense than the oceanic crust, covering about 40% of the Earth's surface.
