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Science > The dynamic earth > Flashcards

The dynamic earth Flashcards

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0
Q

What was the name of the super continent?

A

Pangea

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1
Q

What is the theory of the continental drift?

A

That all continents were once a super continent and then drifted apart

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2
Q

Divergent plate boundaries

A

When Tectonic plates head in opposite directions and causes ocean ridges

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3
Q

Convergent plate boundary

A

When plates coldie (head towards each other) causes areas of subduction

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4
Q

What is subduction?

A

Subduction is when one plate slides underneath the other

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5
Q

Transform plate boundary (strike/slip)

A

Causes earthquakes

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6
Q

What causes ocean ridges?

A

Divergent plate boundaries

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7
Q

What causes areas of subduction?

A

Convergent plate boundaries

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8
Q

What plate movement causes earthquakes?

A

Transform plate boundaries

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9
Q

How are earthquakes measured?

A

Using a Richter scale (1-10)

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10
Q

One increase on the Richter scale equals what?

A

30 times increase in energy eg an earthquake that measures 7 on the Richter scale releases 900 times more energy than an earthquake that measures 5

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11
Q

A seismograph is used to measure what?

A

Earthquake intensity

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12
Q

What is the focus of an earthquake?

A

The point of which the earthquake begins

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13
Q

The epicenter is where?

A

Directly above the focus. Movement of crust begins here

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14
Q

What are folds that bend upwards?

A

Anticlines

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15
Q

Folds that bend downwards are?

A

Synclines

16
Q

Where do volcanos generally occur?

A

At an area of subduction

17
Q

Magma is what and from where?

A

Molten rock from the mantle

18
Q

Lava is what?

A

Red hot molten rock that is released

19
Q

What products does a volcano release?

A 
Magma 
Lava 
Hydrogen sulfied (rotten egg smell)
Carbon monoxide 
Ash
And volcanic bombs (large pieces of rock)
20
Q

What are the three types of volcanos?

A

Active, dormant and extinct

21
Q

What is a dorment volcano?

A

A volcano that hasn’t erupted in over 20 years

22
Q

What is an extinct volcano?

A

A volcano that hasn’t erupted for over 1000 years

23
Q

What is the structure of the earth?

A

The inner core
Outer core
Mantle
Crust

24
Q

What is the atmosphere?

A

A blanket of gasses that surrounds the earth

25
Q

What is the hydrosphere?

A

The water on or at the earths surface including oceans etc

26
Q

What’s the earths crust?

A

It includes land forms, rock and soil

27
Q

What’s the mantle?

A

Partially molten rock, the top part of the mantle is the source of magma that erupts onto the surface

28
Q

What’s the outer core?

A

Molten iron and nichol

29
Q

What’s the inner core?

A

Mostly iron, solid owing to the extreme pressure

Science (3 decks)

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