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Flashcards in Rocks Deck (12):
1

How rocks differ

Mineral content
Colour
Hardness
Texture

2

Groups rocks are divided into

Igneous (ingite, fire, eg. magma, lava)

Sedimentary (means pieces)

Metamorphic (means change)

3

Igneous rocks

Comes from latin word meaning fire

Formed as result of volcanic activity

Hot molten magma cooled, solidified on surface/within crust

Granite + Basalt

4

Sedimentary rocks

Remains (sediments) of other rocks, animals, plants

Deposited on beds of seas, lakes, on land

Compressed over time, cemented together

Limestone, sandstone, shale

5

Metamorphic rocks

Metamorphic - to change

Rocks changed in shape/form by great heat + pressure

Already existed as igneous/sedimentary rocks

Marble, quartzite, slate

6

Granite

Formed - molten magna cools under earth's surface

Cooled slowly - millions of years, large crystals

Eventually comes to surface when overlying rocks worn away

Varies in colour - black/grey/pink

Used in building industry & for monuments

Mourne Mountains & Wicklow Mountains

7

Basalt

Lava cools on earths surface

Cooled v quickly, tiny crystals

Dark grey to black

Antrim - Derry plateau. Giant's causeway

8

Limestone

Remains of ting sea creeatures, fish, shells

White to grey

Permeable (allows water to pass through it)

Burren co. Clare & Central plain of Ireland

Make monuments/soil fertility

9

Sandstone

Sand deposited on beds of lakes & rivers & deserts

Brown to red

Building materials

Mountains of Munster

10

Marble

Limestone put under great heat & pressure --> marble

Pure marble - white. Other minerals present - vary red, green, black

Hard rock, used for fireplaces, gravestones, ornaments

Connemara & Cork

11

Quartzite

Sandstone came into contact with magma deep in earth's crust

Consists mainly of grains of quartz tightly packed together

Grey to whitr

Extremely hard rock, Mayo, Donegal, & Wicklow

12

Rocks

Hard material that forms Earth's crust