Flashcards in Earth Sciences Set 1 Deck (46)
What is geology?
Geology is the study of the earth, the rock that makes it, and the processes that change the earth
What is the core?
The core is the centre of the earth.
What are the two layers of the core?
The two layers of the core are the inner core and the outer core.
Describe the inner core.
The inner core is 1216km thick, 4000degrees C, solid iron with some nickle
Describe the outer core.
The outer core is 2270 km thick, 3600 degrees C, LIQUID IRON with some nickle.
What is between the inner and outer core?
There is a liquid-solid boundary between the two layers.
Why is the outer core liquid and not the inner core?
The outer core is liquid because there is less pressure pushing on it that the inner core.
How does the solid inner core move?
The solid inner core rotates within the liquid outer core.
How is the earth magnetic?
The rotation of the solid iron and nickle inner core generates the magnetism.
What is the source of the earth's internal heat?
The heat comes from radioactive materials that release heat as they break down. This happens in the core.
What is outside the core?
The mantle is outside the core.
How many parts does the mantle have?
The mantle has two parts, lower and upper
Where is the asthenosphere?
The asthenosphere is in the upper mantle
What is the mantle made of?
The mantle is made of hot, dense, semi-solid rock.
Describe the lower mantle
The lower mantle is 2885km thick and is 84% of the earth's total volume. Cooler than the core at 3000 degrees C.
Which is denser (more solid) the upper or lower mantle?
The lower mantle is denser than the upper mantle.
What is between the upper and lower mantle?
The transitions zone is between the two mantle layers.
Where is the mesosphere?
The mesosphere is in the lower mantle.
How far below the earth's surface is the transition zone?
The transition zone is 400-660km below the surface of the earth.
How big is the upper mantle?
The upper mantle goes from the crust down to about 400km below the surface.
What does asthenosphere mean?
Asthenosphere means without strength and ball... a soft flowing rock.
What floats on top of the asthenosphere?
The crust floats on top of the asthenosphere.
What is the crust?
The crust is a solid layer of rock.
Describe the crust.
The crust is 5-80km thick, outside temp to an internal temp of 500degrees,
Where are the thickest parts of the earth's crust?
the continental crust is the thickest part of the crust.
Where are the thinest parts of crust found?
The thinest parts of the earth's crust are found on the ocean floor....the ocean crust.
Do people know more about the universe or what's below the earth's crust?
They know more about the universe.
What are seismic studies?
Seismic studies are the studies of the energy waves made by the earth when it shakes...an earthquake monitor
What are the energy waves of the earth called?
The earth's energy waves are called seismic waves.