Earth Sciences Set 1 Flashcards

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1
Q

What is geology?

A

Geology is the study of the earth, the rock that makes it, and the processes that change the earth

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2
Q

What is the core?

A

The core is the centre of the earth.

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3
Q

What are the two layers of the core?

A

The two layers of the core are the inner core and the outer core.

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4
Q

Describe the inner core.

A

The inner core is 1216km thick, 4000degrees C, solid iron with some nickle

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5
Q

Describe the outer core.

A

The outer core is 2270 km thick, 3600 degrees C, LIQUID IRON with some nickle.

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6
Q

What is between the inner and outer core?

A

There is a liquid-solid boundary between the two layers.

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7
Q

Why is the outer core liquid and not the inner core?

A

The outer core is liquid because there is less pressure pushing on it that the inner core.

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8
Q

How does the solid inner core move?

A

The solid inner core rotates within the liquid outer core.

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9
Q

How is the earth magnetic?

A

The rotation of the solid iron and nickle inner core generates the magnetism.

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10
Q

What is the source of the earth’s internal heat?

A

The heat comes from radioactive materials that release heat as they break down. This happens in the core.

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11
Q

What is outside the core?

A

The mantle is outside the core.

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12
Q

How many parts does the mantle have?

A

The mantle has two parts, lower and upper

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13
Q

Where is the asthenosphere?

A

The asthenosphere is in the upper mantle

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14
Q

What is the mantle made of?

A

The mantle is made of hot, dense, semi-solid rock.

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15
Q

Describe the lower mantle

A

The lower mantle is 2885km thick and is 84% of the earth’s total volume. Cooler than the core at 3000 degrees C.

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16
Q

Which is denser (more solid) the upper or lower mantle?

A

The lower mantle is denser than the upper mantle.

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17
Q

What is between the upper and lower mantle?

A

The transitions zone is between the two mantle layers.

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18
Q

Where is the mesosphere?

A

The mesosphere is in the lower mantle.

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19
Q

How far below the earth’s surface is the transition zone?

A

The transition zone is 400-660km below the surface of the earth.

20
Q

How big is the upper mantle?

A

The upper mantle goes from the crust down to about 400km below the surface.

21
Q

What does asthenosphere mean?

A

Asthenosphere means without strength and ball… a soft flowing rock.

22
Q

What floats on top of the asthenosphere?

A

The crust floats on top of the asthenosphere.

23
Q

What is the crust?

A

The crust is a solid layer of rock.

24
Q

Describe the crust.

A

The crust is 5-80km thick, outside temp to an internal temp of 500degrees,

25
Q

Where are the thickest parts of the earth’s crust?

A

the continental crust is the thickest part of the crust.

26
Q

Where are the thinest parts of crust found?

A

The thinest parts of the earth’s crust are found on the ocean floor….the ocean crust.

27
Q

Do people know more about the universe or what’s below the earth’s crust?

A

They know more about the universe.

28
Q

What are seismic studies?

A

Seismic studies are the studies of the energy waves made by the earth when it shakes…an earthquake monitor

29
Q

What are the energy waves of the earth called?

A

The earth’s energy waves are called seismic waves.

30
Q

How do we get direct evidence of the composition of the earth?

A

We get evidence of the earth’s make up by digging deep.

31
Q

What did science fiction writer, Jules Verne, think was at the center of the earth?

A

Verne thought dinosaurs lived at the center of the earth. He was wrong.

32
Q

Why can we not know for sure what is at the centre of the earth?

A

We can’t get to the center of the earth, so we don’t know for sure what is there.

33
Q

Why do we know more about the moon than the center of the earth?

A

We can get to the moon but not the center of the earth.

34
Q

What was Project Mohole?

A

Project Mohole was a race to dig as deep as possible.

35
Q

Why was it named Project Mohole?

A

It was short for Mohorovic Discontinuity, which is the boundary between the curst and the mantle.

36
Q

What is the boundary between the crust and the mantle called?

A

The boundary between the crust and the mantle is called the Mohorovic Discontinuity

37
Q

Who discovered the Mohorovic Discontinuity?

A

Scientist Andrija Mohorovicic found the Mohorovic Discontinuity.

38
Q

What was Project Mohole?

A

To dig five holes in the ocean floor as deep as possible.

39
Q

Why was Mohole dug in the ocean and not on land?

A

The ocean floor crust is the thinest place to dig.

40
Q

Why was Mohole a failure and a success?

A

They did not continue to dig below 183 m, but they learned a lot about ocean deepwater drilling.

41
Q

What was the Kola Superdeep Borehole?

A

Russians drilled into the Kola Peninsula near Finland, They got to 12 262m deep and it is the deepest artificial point on earth. (not naturally made)

42
Q

What did they learn in Kola?

A

At this depth, the crust is 180 degrees not the 100 that they thought, the rock was turning to goo so they had to stop.

43
Q

In 2011 what was drilled?

A

In 2011 the Russians drilled the longest extended-reach well (long, diagonally slanted) 12 345m to get oil and gas at Sakhalin island.

44
Q

What is the IODP and the ship Chikyu?

A

Chikyu is the largest research ship ever build and aboard is the Integrated Ocean drilling program (IODP)

45
Q

What does the IODP hope to achieve?

A

The IODP hope to drill to the core and have already set a new drilling research hole record and got to 2466 m in 2012

46
Q

Why is it important to drill to the core?

A

Scientists do not know a lot about the core and their assumptions from seismic data may not be correct. They hope to use their learning to better predict earthquakes and tsunamis.