Definitions: Plates And Landforms (1) Flashcards Preview

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Flashcards in Definitions: Plates And Landforms (1) Deck (20)
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1

Continental shelf

The edge of a continent that lies under relatively shallow water. The shelf descends towards the ocean floor by the continental slope

2

Plates

Very large sections that the outer layers of the earth are broken into

3

Transform plate boundaries

When two plates slide past each other. Rock is neither created not destroyed, there are passive boundaries

4

Divergent plate boundary

When two plates deprecate from each other. New rock is created, these are constructive boundaries

5

Convergent plate boundaries

When two plates collide. Rock is destroyed, these are destructive boundaries

6

Subduction

The process where the heavier plate slides beneath the lighter plate and slips down into the mantle

7

Fold

A bend or curve in the stratified rocks of the earths crust

8

Fault

A crack or fracture in the earths crust

9

Anticline

An upward fold resulting from the compression of rocks

10

Orogeny

The term used to describe a period of mountain building

11

Seismology

Study of earthquakes

12

Focus

The place where the energy from an earthquake is first released deep below the earth’s surface

13

Epicentre

The point on the earths surface directly above the focus

14

Liquefaction

Clays and sands mix with the ground water during an earthquake. This turns the ground into quicksand like material in minutes

15

Basic lava

Low in silica and very runny, eruptions are gentle

16

Acidic lava

High in silica and pasty. Eruptions are violent

17

Pyroclastic materials

Group name for the airborne debris that erupts from a volcano. It includes ash, dust, cinders, pebbles and rocks

18

Extrusive landforms

When magma makes its way to the surface of the earth and it is known as lava, it cools and solidifies to form various structures. Because these structures on the the surface, they are known as extrusive landforms

19

Intrusive landforms

Some magma involved in an eruption does not reach the surface, instead it forces its way into the rocks of the crust. It then cools deep underground to form intrusive landforms

20

Syncline

A downward fold resulting from the compression of rocks