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Flashcards in L1 - Erta Ale Deck (20)
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1

Describe the structure of the earth

Inner core (solid), outer core (liquid), Mantle (molten rock, liquid), Upper mantle/ Lithosphere (semi-solid),Crust (solid)

2

What the device used to measure radiation?

A geiger counter

3

What feature of volcanos builds pressure leading to a more violent eruption?

A plug

4

What waves are used to measure how large each section of the earth is?

S waves and P waves.

5

What is the crust?

The top layer of the Earth, it is a dry brittle surface of recently cooled lava.

6

What are the two types of tectonic plates?

Oceanic and continental

7

What is the lithosphere?

The top of the mantle and all of the crust, together form the mantle.

8

What is the asthenosphere?

Sticky, viscous, dense rock – slowly starts to move. This causes plate tectonics (The movement of plates), its what the plates rest on.

9

What causes convection currents?

The temperature gradient in the mantle, as you get closer to the core, its hotter.

10

What is the Magnetosphere caused by?

Its produced by the spinning nickel and iron inner core, which produce a magnetic shield protecting the earth from solar radiation

11


What are the 3 types of plate margins?

Constructive, destructive, transform

12

What process usually causes the formation of a trench?


Subduction between 2 Oceanic pates

13

Where and how is new land formed?

New land is formed at a divergent, constructive plate boundary, as the 2 plates move apart, the magma from below seeps up and dries to fill the gap.

14

What natural disaster often occurs at a transform plate margin?

An Earthquake

15


What is the asthenosphere?

The asthenosphere lies beneath the lithosphere and consists of partially molten rock. S waves passing through this layer are significantly slowed

16


Name a constructive plate margin

The mid atlantic ridge

17


What landscape features are often found at convergent plate margins?

Trenches, Mountain Ranges, Subduction Zones, Volcanos

18


What happens to the subducted plate at a convergent plate margin?

The plate is driven down into the mantle where it melts into magama, then that magma rises up and will force its way out of a volcano

19


Name a mountain range found at a convergent plate boundary.


The Andes mountains, the Himalayas

20

What factors influence lava viscosity

Silica rich lava is a thin, runny viscosity, usually erupted from active volcanoes

Whilst granite rich causes violent eruptions of thick lava from mainly dormant volcanoes