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Flashcards in Geology Deck (43):
1

igneous rock

come from magma and lava

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magma

liquid rock the stays under the surface of the earth

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lava

liquid rock that is above the surface of the earth

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extrusive rock

when rocks that drys when it is above the surface of the earth

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intrusive rock

when rocks dry when they are under the surface

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mineral

a solid naturally occurring substance

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lithosphere

the rigid outer layer of the earth

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Asthenosphere

the upper layer of the mantle

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crystal

a piece of a homogeneous solid substance

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erosion

the wearing away of something naturally

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floodplain

a flat plain near a river where sediment is deposited

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glaciers

large bodies of ice

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moraines

rocks that are moved by glaciers

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sandstone

sediment rock that has been compressed small pieces of sand into a rock

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mudstone

a rock made from fine grains

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shale

a fine grain sedimentary rock that is made from hardening clay

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siltstone

a sedimentary rock that has one particle different from mud or sand stone

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conglomerate

a sedimentary rock that has different rock cemented together

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limestone

a sedimentary rock formed from sea organism

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coal

a sedimentary rock that is formed from dead plants and animals

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salt rock

a sedimentary rock formed when a seabed or salt lake drys up

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metamorphic rocks

they are rock that go though change

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metamorphism

when something changes into something else

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mineral ores

rocks mined to obtain metal

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mining

the extraction of natural resources

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environmental impact statement

study of the affect in plannedproject on the earth

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rehabilitated

once something ahas been restored

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overburded

waste rock removed for below topsoil

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open cut mining

when rocks are blown up on the surface of the earth so they an get to the rocks under neath

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under ground mining

mining underground

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stone age

the first known period of a prehistoric human culture characterized by the use of stone

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alloy

a metal made by combining to or more metallic elements

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flint

a grey rock that consists of nearly pure silica

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percussion flaking

shape of a stone or implemint by striking and chipping flackes off of a rock, bone or antler

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fossil

any remains, impression, or trace of an animal or plant of a former geological age; evidence of life in the past

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folding

the buckling of rocks. It is caused when rocks are under pressure from both sides.

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palaeontologists

a scientist who studies fossils

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relative age

the age of a rock compared with the age of another rock

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carnivores

animal that eats other animals

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scavengers

animals that eat dead plant and animal material

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mould

cavity in a rock that shows the shape of the hard parts of an organism; types of fungi found growing on the surface of foods

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trace fossils

fossils that provide evidence, such as footprints, that an organism was present when the rock was formed

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extinct

describes volcanoes that are no longer active. Extinct volcanoes have not erupted for thousands of years and show no sign of future eruption.