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Flashcards in Earth Science Deck (31):
1

Lithosphere

The solid outer part of the earth. It can be called the crust. It is the thinnest out of all the layers

2

Asthenosphere

In between the lithosphere and the upper mantle. Also a convection occurs

3

Mantle

The mantle is in between the lithosphere and the core. It takes up 80% of the volume. In is where all the magma comes out of the volcano. It’s the largest part of the earth.

4

Core

Split into 2 parts the outer and the inner core. The core is the center of the earth and is the hottest part.

5

Seismic waves

Waves of energy that travels through the earths crust, caused by earthquakes

7

Continental drift

The movement of the plates in the earths crust in relation to each other

8

Pangaea

A super-continent that existed 225 million years ago. It was all the continent together and over time they separated

9

Plate tectonics

The theory concerning the movement of continental plates

10

Convection current

circular movement that occurs when warmer, less dense fluid particles rise and cooler, denser fluid particles sink

11

Continental crust

the plates of the Earth's crust that make up the land

12

Subduction

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

13

Destructive plate boundaries

a convergent boundary where two plates collide

14

Constructive plate boundaries

plate that creates new land from cooling magma

15

Panthalassa

The sea that surrounded the Pangaea

16

Ocean ridges

an area where the tectonic plates move apart, allowing magma from the mantle to rise, forming underwater volcanoes and creating new oceanic crust

17

Conservative plate boundaries

boundaries between sliding plates, like the San Andreas Fault in the United States

18

Laurasia

one of the two smaller continents created when the supercontinent Pangaea broke apart about 200 million years ago

19

Gondwanaland

one of the two smaller continents created when the supercontinent Pangaea broke apart about 200 million years ago

20

Tremours

vibration on the Earth's surface caused by an earthquake

21

Epicenter

Epicentre: the point on the Earth's centre directly above the site where an earthquake originates

22

Focus

The point in which an earthquake begins

23

Triangulation

Triangulation: finding a location by using at least three different sources of detection

24

Seismograph

Seismograph: an instrument used to detect and measure the intensity of an earthquake

25

Richter scale


Richter scale: a scale that measures the amount of energy released during an earthquake

26

Primary waves

compression waves that move through the Earth in the same way that sound waves move through air

27

Second waves

the second set of waves to be detected after P-waves. During seismic activity, secondary waves or S-waves travel in the form of transverse waves.

28

Body waves

Body waves: waves that travel through the interior of the Earth; P-waves and S-waves are said to be body waves

29

Surface waves

Body waves: waves that travel through the interior of the Earth; P-waves and S-waves are said to be body waves

30

Seismologists

Seismologists: a scientist who studies earthquakes

31

Tsunamis

Tsunamis: a powerful ocean wave triggered by an undersea earth movement

32

Meltdowns

the melting of a nuclear-reactor core as a result of a serious nuclear accident