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Flashcards in Earth Scie Deck (85)
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1

Intensity

Modified Mercalli's Scale
Effects and Damages

2

Magnitude

Richter Scale
total energy released at its focus

3

Continental Plate

less Dense

4

Oceanic Plate

Denser

5

Focus

Origin of earthquake

6

Epicenter

above the focus

7

shape of the Earth

Oblate spheroid (flattened at the poled, bulging at the sides)

8

Diastrophism

Any movement of the Earth's Crust

9

Layers of the Earth

Crust
Mantle
Outer Core
Inner core

10

Crust

Variety of igneous, metamorphic, sedimentary rocks
occupies less than 1% of Earth's volume.

11

The upper part of the mantle is composed mostly of

peridotite, a rock denser than rocks common in the overlying crust.

12

Mohorovicic discontinuity

The boundary between the crust and mantle

13

Mantle

makes up a whopping 84% of Earth’s total volume.
silicates of iron and magnesium, sulphides and oxides of silicon and magnesium.

14

Molten material that surrounds the core

Mantle

15

Lithosphere

Solid outerpart of the Earth
included brittle upper mantle and the crust
most rigid (elastic but not viscous)
Coolest of the Earth's layer

16

Asthenosphere

Much hotter and fluid than lithosphere
malleable
subduction zones

17

Outer Core

magma like liquid layer that surrounds the Inner Core and creates Earth's magnetic field.
iron and some nickel

18

Inner Core

believed to be just as hot as the sun's surface.
made up of an iron-nickel (metal) alloy.
Solid because of high pressures
siderophiles (gold, cobalt, platinum)

19

Continental Drift Theory

Alfred Wagner
Pangaea

20

Theory of Sea-floor spreading

occurs at mid-ocean ridges where new oceanic crust if formed through volcanic activity
support continental drift

21

Plate Tectonic Theory

Lithosphere is divided into tectonic plates

22

three types of plate boundaries

Divergent
Convergent
Transform

23

Mountain Ranges

formed by collision of two continental plates

24

Trenches

deepest part of the ocean formed by collision of continental and oceanic plate

25

mid-oceanic ridge

chain of mountains in the middle of the ocean
formed by spreading of the ocean floor

26

Faults

crack on Earth's Crust when plates slip past each other

27

Volcanoes

collision of continental and Oceanic plate
molten rock, gases, pyroplastic debris erupt through the crust

28

magma

molten rocks beneath the crust

29

lava

molten rocks at the surface of the crust

30

Pyroplastic materials

mixtures of hot, dry rock fragment and hot gases