Term
| How can you tell the difference between an extrusive and intrusive rock? |
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Definition
Intrusive rocks have larger crystals/grains
Extrusive rocks are much smaller until you could not see them |
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Term
| Which rock type appeared first on earth? Why? |
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Definition
| Igneous rocks because sedimentary & metamorphic require other rocks to be formed first. |
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Term
| Match rock with rock type, shale? |
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Definition
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Term
Match rock with rock type, basalt?
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Definition
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Term
Match rock with rock type, breccia?
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Definition
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Term
Match rock with rock type, marble?
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Definition
| metamorphic, comes from limsetone |
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Term
Match rock with rock type, limestone?
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Definition
| sedimentary, chemical and/or organic |
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Term
Match rock with rock type, sandstone?
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Definition
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Term
Match rock with rock type, gneiss?
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Definition
| metamorphic, came from granite |
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Term
Match rock with rock type, obsidian?
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Definition
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Term
| the two ways the age of rock laters can be determined are _________ dating and ____________ dating. |
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Definition
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Term
complete the following radioactive-decay equations. identify the isotope X. indcate whether alpha or beta decayse takes place.
12B---->12C + AX
5 6 Z |
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Definition
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Term
225Ac---->221Fr + AX
89 87 Z |
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Definition
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Term
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Definition
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Term
212Bi---->AX + 4He
83 Z 2 |
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Definition
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Term
| carbon-14 has a half life of about 5700 years. explain why this would not be a good isotope to use to determine the age of a rock. |
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Definition
| there would not have ebough left to the determine the age |
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Term
| calculate the time required for three-fourths of a sample of cesium-138 to decay if its half-life is 32 minutes. |
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Definition
1/4=2 half-lives
32*2=64 minutes or 1 hour and 4 minutes |
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Term
| calculate the half-life of cesium-135 if 1/8 of a sample remains after 6 million years. |
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Definition
1/8=3 half-lives
6million yrs/3 half-lives= 2 million years |
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Term
| why does cesium-138 decay more quickly then cesium-135? |
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Definition
| because cesium-138 is less stable than cesium-135 |
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Term
| the amount of time it takes for three-fourths of a radioactive sample of an isotope of bromine to decay. the half0life of the isotope is 16.5 hours. |
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Definition
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Definition
| a process in which the unstable nuclei of isiotopes emit particles or release energy to become stable isotopes |
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Term
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Definition
| the released energy and matter |
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Term
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Definition
| positively charged and more massive than any other type of nuclear radiation |
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Term
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Definition
| fast moving electrons and positively charged particles called positrons |
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Term
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Definition
| a form of electromagnetic energy |
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Definition
| the time in which half of a radioactive substance decays |
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Term
| type of rock formed from cooling of magma or lava |
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Definition
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Term
| type of rock formed from sediments cememnted together |
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Definition
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Term
| type of rock formed when heat and pressure are added |
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Definition
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Term
| clastic, organic, and chemical are examples of this rock type |
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Definition
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Term
| a rock formed from evaporation |
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Definition
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Term
| for undisturbed sedimentary rock formations, the bottom layer is always |
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Definition
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Term
| an impression left in a rock by a plant of animal is called a(n) |
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Definition
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Term
| extrusive igneous rocks are formed by this material cooling |
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Definition
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Term
| assuming no change in the position of the rock layers, the oldest will be on the bottom and the youngest on |
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Definition
| principle of superposition |
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Term
| molten material under the earth's surface is called |
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Definition
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Term
| fossils are only found in this rock type |
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Definition
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Term
| the most abundant mineral in rocks |
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Definition
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Term
| dark-colored igneous rocks |
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Definition
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Term
| light-colored igneous rocks |
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Definition
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Term
| large crystals scattered on a background of much smaller crystals |
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Definition
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Term
| a metamorphic rock with alternating light and dark bands would be called |
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Definition
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Term
| pumice is an example of which rock type? |
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Definition
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Term
| conglomerate is an example of which rock type? |
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Definition
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