Science Yearly Flash Cards

Frage	Antworten
What are the three main types of rocks?	Sedimentary, Igneous and Metamorphic
How long does it take to form a sedimentary rock?	Millions of years
How do you tell the age of the layers in a sedimentary rock?	Oldest at the bottom, newest at the top.
How are igneous rocks form?	Molten rock (magma) forms inside the earth. The magma cools and solidifies to make igneous rock
How are crystals formed?	Crystals form when the rock cools. The size depends on how quickly the magma cooled. The slower the cooling the larger the crystals, and vice versa.
Do igneous rocks contain fossils?	No, as any fossils in the original rock would have been melted down.
How are metamorphic rocks formed?	Earth movement causes rocks to be deeply buried or squeezed, and as a result the rocks are heated and put under great pressure. Minerals inside them change chemically therefore making metamorphic rocks.
What are the three types of weathering?	Chemical, Physical and Biological. (Chemical and Physical being the most important for this topic.)
How does the wind, rain and waves cause weathering?	Wind blows tiny grains of sand against a rock, slowly wearing it away (abrasion). Over a longer period of time, wind and rain also wear away rocks.
What are the stages of the rock cycle?	Rock weathers - rock erodes - sedimentary rock forms - burying and squeezing with heat pressure - metamorphic rock - rock melts - igneous rock - volcanic eruption

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