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18 Cards in this Set
- Front
- Back
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cast
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type of fossil that forms when sand, minerals, or other matter fill a cavity-shapped mold overtime and then harden, forming a replica of the original organism.
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mold
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a fossil type that is an impression of a shell, bone, or other body parts left in the rock after the organism is covered by soft material.
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fossil
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the preserved remains or impression of the organisms of earths geological past.
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weathering
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the breaking down of earths features into smaller pieces.
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erosion
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the process of which materials are broken down and moved from place to place.
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igneous
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rock formed by the solidification of molten magma.
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metamorphic
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rock altered by pressure and heat.
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sedimentary
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rock formed from consolidated clay sediments.
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strata
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A layer or a series of layers of rock in the ground
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name an example of each rock type.
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igneous, sedimentary, and metamophic
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what is a mineral- list and define
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minerals have 5 properties, color-a mineral may be any color, or different color. hardness- a mineral may be very hard, or very soft,or in-between. Diamonds are the hardest mineral , and talc is the softest. Luster- is how a mineral's surface reflects light. A mineral can be shiny.
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how do scientists identify minerals?
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Color
Luster Streak Cleavage/Fracture |
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how do scientist know the age of fossils?
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scientist date the rock;strata first, then date the fossil in its rock.
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what is radiometric dating?
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it uses the radiometric element to help determine the age by measuring the age of radioactive elements in the fossil.
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how do scientists know when the dinosaurs became extinct?
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the fossils were found below a layer with no other dino. fossils above.
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(discussion ?-write a paragraph)...why is it important to study rocks and fossils?
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to find evidence of plants and animals that lived long ago.
-to prepare for events so humans and animals can survive them -to prevent catastrophic events from happening again -NASA has established a reserch team to study rocks, astroids and commits |
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what impact would it have on earth if it was hit by a commit or astroid?
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possibly there would be a major explosion and a shock wave that would cause earthquakes, tsunamis, fires, and massive destruction.
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what is a "shooting star?"
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A small, rapidly moving meteor burning up on entering the earth's atmosphere.
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