Lesson 1-Structure of the Earth Flashcards
What is the thickness of the Mantle?
2,900km
What is Most of the mantle made up of?
Semi- molten
What does the mantle have?
A temperature gradient
Where are the highest temperatures closest to?
The heat producing core
Describe the rocks in the upper mantle
Cooler and Brittle
What are rocks like in the lower mantle?
Hot and brittle (but not molten)
What are rocks in the lower mantle rich in?
Iron and magnesium
What state is the outer core?
Liquid
What does the outer core generate?
Magnetic field
What percent of the outer core is made up of iron and sulphur?
88% iron and 12% sulphur
What are the temperatures within the outer core?
4400 to 6100 degrees C
Is the crust thick or thin?
Thin
What are the rocks within the crust rich in?
.Silicon
.Oxygen
.Aluminium
.Potassium
.Sodium
What is the hottest part of the Earth?
Inner Core
Is the inner core solid or liquid?
Solid
What is the inner core made of?
Iron (80%)
Nickel(20%
What is the temperatures within the inner core?
6000-7000 degrees C
Why and what causes the high temperatures within the inner core?
The radioactive decay of matter here
What does heat rising and falling within the mantle create?
Convection Currents
What happens to the plates when the convection currents converge?
Plates move towards each other
