INNER CORE
What is the inner core made of ?
Iron and nickel
HOW thick IS THE OUTER CORE in kilometers?
2,400 KILOMETERS
The mantle makes up what % of the Earth?
68%
How thick is the crust? 0 - ? km
45 km (On Layers of the Earth sheet)
The 4 layers of Earth
crust, mantle, outer core, inner core
What layer is just outside of the inner core?
Outer core
AT HOW MANY DEGREES IS THE OUTER CORE? (Range)
5,000-6,200° CELSIUS
The mantle directly touches the outside of what part of the earth's inner layers?
Outer core
Name 2 types of Earth's Crust
Continental
Oceanic
Define trench
When an oceanic plate sinks below a continental plate, and goes into the mantle
What physical State of matter is the inner Core?
SOLID
What is responsible for the protective magnetic field around Earth?
Convection currents in the outer core
What layer surrounds the the outside of the mantle
Crust
Which type is less dense..
Continental or Oceanic?
Continental
Hot fluid is _______________ dense than cold fluid, and therefore, will _______________________.
Less; rise
Which layer is the thickest?
Mantle
What is the pressure of the outer core?
1.3 to 3.3 million atmospheres
Temperatures in the mantle are from 1000 in the upper and _________ in the lower mantle
5000
Rocks of the oceanic crust is mainly
basalt (volcanic)
The term Wegner used to describe the Earth when all continents were attached into one supergiant continent.
Pangaea
Temperatures rise up to what Celsius in the Inner Core?
6800
How do we know about the outer core if we never saw it?
Seismic waves
How do mid-ocean ridges turn magma from the mantle into rocks on the crust?
At a boundary between 2 oceanic plates, the hot magma rises through the crack and solidifies, adding more solid rock to the crust under the ocean.
When part of the crust (tectonic plate) dips below another......the term is called...?
Subduction
The reason the Atlantic Ocean is expanding
There are not so many trenches, so the mid-ocean ridge causes for seafloor spreading