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Flashcards in Yr 8 AP Science Revision Tim HW Deck (26)
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1

Explain the effects that continental drift has had on the planet.

Answer-

2

Magma

A very hot mixture of molten rock and gases that ins below the Earth’s surface.

3

Dormant

Describes a volcano that has not erupted for more than 20 years but is not considered extinct.

4

Tremor

Vibration on the Earth’s surface caused by an earthquake

5

Epicentre

The point on the Earths centre directly above the site where the earthquake orignates. This site is called the focus.

6

Seismograph

An instrument used to detect and measure the intensity of an earthquake

7

Richter scale

A scale that measures the amount of energy released during an earthquake

8

P waves or primary waves

Compression waves that move through the earth in the same way that sound moves through air.

9

S waves or secondary waves

The second set of waves after p waves. These waves travel in the form of transverse waves

10

Transverse waves

A wave in which the medium vibrates at right angles

11

A very hot mixture of molten rock and gases that ins below the Earth’s surface.

Magma

12

Describes a volcano that has not erupted for more than 20 years but is not considered extinct.

Dormant

13

Vibration on the Earth’s surface caused by an earthquake

Tremor

14

The point on the Earths centre directly above the site where the earthquake orignates. This site is called the focus.

Epicentre

15

An instrument used to detect and measure the intensity of an earthquake

Seismograph

16

A scale that measures the amount of energy released during an earthquake

Richter scale

17

Compression waves that move through the earth in the same way that sound moves through air.

P waves

18

The second set of waves after p waves. These waves travel in the form of transverse waves

S waves

19

A wave in which the medium vibrates at right angles

Transverse wave

20

Explain the process of subduction.

Answer-

21

Subduction

Process in which two tectonic plates push against each other and oceanic crust sinks below the less dense continental crust

22

Continental crust

The plates of earth that make up the land

23

Oceanic crust

One of the types of crust that makes up Earths outer layer. Oceanic crust is thinner than continental crust and is made up of dense, heavy rocks such as basalt.

24

Convection current

Circular movement that occurs when warmer, less dense fluid particles rise and cooler, denser fluid particles sink.
In the Earths case, the fluid is magma.

25

Mantle

Thick layer inside the Earth below the crust. Most of the mantle is solid rock, though the upper part is molten rock called magma.

26

Plate tectonics

The theory concerning the moving of the continental plates