Science-Planet Earth Gr 8

Front 1

Earthquake

Back 1

tremblings or vibrations of of the ground, caused by the sudden release of energy that has slowly been building up in the earth's crust

Front 2

weathering

Back 2

process that wears down rocks and other objects

Front 3

glacier

Back 3

moving mass of ice and snow

Front 4

bedrock

Back 4

layer of solid rock beneath the loose rock fragments

Front 5

minerals

Back 5

pure, naturally occurring solid materials that are building blocks of rock; all rocks are made of minerals

Front 6

magma

Back 6

molten rock inside the earth

Front 7

lava

Back 7

molten rock that flows out of a volcanoe

Front 8

properties

Back 8

features that a material or object has

Front 9

colour

Back 9

property used to classify and identify rocks and minerals

Front 10

model

Back 10

idea of something that cant be fully known or seen; a way of demonstrating an object or a concept that is difficult to picture in its real form

Front 11

geologist

Back 11

scientists who study the interior and surface of the earth

Front 12

inner core

Back 12

the central layer of earth believed to be solid with a temperature of about 700 *C; About 1250 km thick

Front 13

outer core

Back 13

liquid section of the central layers of earth; about 2200 km thick

Front 14

mantle

Back 14

first layer that makes up the interior of the earth; about 2900 km thick

Front 15

crust

Back 15

layer that covers the surface of the earth where all living things are found

Front 16

focus

Back 16

first place that the rocks break below the surface in an earthquake

Front 17

lustre

Back 17

the way the surface of a mineral looks in the light

Front 18

mountain building

Back 18

process of creating mountains

Front 19

faults

Back 19

large cracks in the rock; most mountains were created by a combination of folding and faulting

Front 20

Igneous rocks

Back 20

rocks that form from hot, Molten rock.

Front 21

streak

Back 21

color of powder a rock/mineral leaves behind when you rub it across a rough surface.

Front 22

converging boundary

Back 22

edge or location where continental plates come together.

Front 23

Continental drift

Back 23

Hypothesys-Alfred Wegener
Movement of continental land masses, Continents used to be all put together, called pangaea

Front 24

subduction

Back 24

collisions between oceanic and continental plates where the dense, heavy ocean plate slides below the lighter continental plate.

Front 25

Diverging boundary

Back 25

edge or location where the continental plates are moving apart.

Front 26

Theory of Plate Tectonics

Back 26

the idea that the continental crust is broken up into large areas called plates; all plates are moving very slowly in various directions