Rocks 1. Flashcards
What is stage 1 of rock cycle?
The very first rocks formed were igneous rocks. These rocks formed from cooling magma or lava
What is stage 2 of rock cycle?
Over time weathering and erosion breaks down rocks into small fragments called sediments which are transported by sea, rivers, ice and wind
What is stage 3 of rock cycle?
Sediments are deposited in seas or lakes and covered by other sediments. Compression turns the sediments into sedimentary rocks. These rocks can also be weathered
What is stage 4 of rock cycle?
Heat from contact with molten magma and pressure causes by folding changes not igneous and sedimentary rocks into metamorphic rocks
What is stage 5 of rock cycle?
Sometimes plate movements cause rocks to melt back into mantle
Describe rock cycles only using one word per stage
—igneous
-weathering and erosion
-transportation and deposition
—sedimentary
-heat and pressure
—metamorphic
-melting
How is granite formed?
Magma cooled in earths crust
What crystals are found in granite?
Large
Mica, feldspan, quartz
Describe granite
Rough
Grey, specked
Hard
Where is granite found?
Wicklow mountains
How is basalt formed?
Magma cooled on earths surface
What are basalt’s crystals?
V small
Iron oxide
Describe basalt
Smooth
Black,dark grey
Very hard
Where is basalt found?
Antrim
How is limestone formed?
Sediments and dead Shelly sea creatures settle at bottom of seas and lakes formed strata and were compressed to form layers of rock
Describe limestone
Smooth to rough
Pure white to grey
Soft easily scratched
Where is limestone found?
Clare
How is sandstone formed?
Layers of sand compressed and cemented by silica together on ocean floor
Describe sandstone
Smooth to rough
Yellow to red
Harder than limestone
Where is sandstone found?
Kerry and cork
How is marble formed?
Great heat from magma baked limestone and formed crystals
Describe marble
Smooth, cold to touch
White to black with veins of red,green, yellow
Hard
Where is marble found?
Connemara
How is quartzite formed?
Great heat from magma bales a hardened sandstone
Describe quartzite
Smooth to rough
White-grey sparkly
V hard
Where is quartzite found?
Wicklow
