Classifications
Earth Rocks!
Soil
Minerals
Fossils
100
The three classifications of rocks.
What is Igneous, sedimentary, and metamorphic?
100
Made up of pieces of rock called sediments that have been pressed and cemented together.
What are sedimentary rocks?
100
Soil that is made up of decayed parts of once-living organisms. It is dark, soft, and very crumbly.
What is humus?
100
Are solid, formed in nature, have never been alive, and have properties by which they can be identified.
What are minerals?
100
The remains of a living thing that lived long ago that has turned to rock.
What is a fossil?
200
How they are formed, color, visible crystals or minerals, grain pieces, patterns in the rock such as stripes.
What are the properties rocks can be classified by?
200
May be glassy or grainy with crystals of different types of minerals in them. Granite is an example of this type of rock.
What are igneous rocks?
200
Has very small grains, much smaller than sand or silt, and holds water easily. It is sticky when wet, but when it dries, it forms hard clumps.
What is clay?
200
Refers to whether the mineral can be scratched or can scratch something else.
What is hardness?
200
A cavity or opening in a rock that has the shape of once living thing.
What is a mold?
300
Once melted material (lava or magma) that has cooled and hardened.
What is igneous rock?
300
Was once another type of rock deep inside Earth, but heat and the pressing of the rocks above caused the minerals to change.
What is metamorphic rock?
300
This feels gritty and has large grains with large spaces between the grains. This lets water leave it quickly.
What is sand?
300
This can be used along with other properties to help identify a mineral.
What is color?
300
A mold that has been filled in with sediments which harden and take the shape of the once living thing.
What is a cast?
400
Humus, sand, clay, and silt.
What are types of soil?
400
May contain pieces of animal shells or skeletons or other remains of plants or animals. Sandstone and limestone are examples.
What are sedimentary rocks?
400
Has pieces that are smaller than sand. It feels like powder.
What is silt?
400
Some minerals can be very shiny, pearly, or glassy and other minerals are dull.
What is luster?
400
Actual parts of the living thing such as shells, bones, or teeth that have turned to stone. For example, sometimes an insect long ago was trapped in tree sap. That sap hardened into a rock called amber. The insect was preserved in the amber stone.
What are preserved parts?
500
Content, texture, or grain size.
What are ways to classify soil?
500
Rocks that were pressed down could have the minerals line up in rows or bands. Sometimes the heat just changes the size of the mineral crystals. Marble and slate are examples.
What are metamorphic rocks?
500
A combinations of soil types that has large and small grains with lots of humus.
What is loam?
500
These include: if an acid (vinegar) is placed on a mineral, it may bubble or fizz, some minerals split into thin sheets, and some minerals have magnetic properties.
What are special properties?
500
Fossil imprints of leaves and other thin objects, such as wings, feathers, and footprints.
What are molds?
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