Rocks And The Rock Cycle
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True or false: a grain of sand can be considered a tiny rock?
Tre
What do you call a scientist that studies rocks?
A geologist
What are the three types of rocks?
Igneous, sedimentary and metamorphic
What are igneous rocks? And what are the two types?
Igneous means fire rock. Most come deep inside the earths core where it’s so hot that rocks are in a liquid form called magma. Magma that cools very slowly inside the earths crust creates one type of igneous rock The other type forms after a volcano erupts. When lava cools it creates igneous rock.
What is the most common type of igneous rock?
Granite
Name a shiny black volcanic rock with sharp edges (igneous) used for knives and arrowheads.
Obsidian
What does sedimentary rock mean?
Sitting rock
What is a sedimentary rock?
A sedimentary rock is formed from igneous rocks that break down into smaller pieces and fall to the ground or to the bottom of a lake or river. After many years these tiny pieces of rock pile on top of one another and cement together to form sedimentary rock. They can also be created from the shells of tiny sea creatures that fall to the bottom of the ocean and get smashed together under the weight of the water.
Give examples of sedimentary rock.
Sandstone (formed close to the shore. Have sand in them) or limestone or shale (farther from the shore with clay)
What does the word metamorphic mean
Changed form
What is a metamorphic rock?
They start out as igneous or sedimentary but over time, extreme or pressure causes them to change into a different kind of rock.
Example of a rock metamorphic?
Limestone (sedimentary) becoming marble ( Metamorphic )
What is the least common type of rock?
Metamorphic
Two ways igneous rocks are formed
1-lava when it cools 2-magma when it cools
What is magma?
Magma is lava under the earths surface but erupts to be lava.
Name two everyday items made of rock
Granite counter tops Knife blades
What are crystals
Solid objects that have naturally occurring geometric forms
What is a Grain
Very small particle
What is the Core
The Center of the earth
What are Volcanos
mountain or hill with a crater in the Center from which lava, gas and rock pieces erupt
What is an Igneous rock
A type of rock that forms from Magma inside the earths crust or lava outside the earths crust
What is a Geologist
A scientist who studies the earth including rocks
What is a Sedimentary rock
A type of rock that is formed by layers of materials such as shells sand and clay
What is Obsidian
Shiny black volcanic rock with sharp edges