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50 Cards in this Set
- Front
- Back
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what are the units of density used to describe the earth?
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kg/m3
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how many GPa are in 1,000 kPa?
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0.001 GPa
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ductile?
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a solid that can deform very easily
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what is solar wind?
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solar wind is the radiation that is coming from the sun
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what are two ways in wich the crust varies?
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1 thickness
2 age |
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how is the crust distinguishable from the topmost solid part of the upper mantle?
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it is chemicly different
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what is the chemical symbol for magnesium?
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mg
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name three elements found in the mantle that are not found in the inner or outer core.
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1 silicone
2 oxygen 3 magnisium |
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convert 750,000 kPa into GPa
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0.7
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convection?
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movement resulting from differences in temp.
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viscsity?
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is a fluids resistance to being deformed
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is the inner core solid?
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yes
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is the outer core liquid?
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yes
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is the crust solid?
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yes
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where would you find oceanic crust?
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under the ocean
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how old is the oldest crust?
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4,.4 billion years old
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how young is the youngest crust?
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less than 1 million years old
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what is the thinnest layer?
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the crust
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what is the thickest layer?
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the mantle
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what is density?
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the amt. of matter in a given volume
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what is the ave. for the entire earth?
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5000 kg/m3
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what is the ave. at the surface
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101.25
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what is the pressure for the core
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330-360 GPa
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symbol for iron
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Fe
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symbol for nickel
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Ni
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melting point of iron is?
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1535*C
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melting point for nickel is?
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1453*C
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what 2 planets have no magnetic feild?
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1 moon
2 venus |
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what 2 planets have very weak magnetic feilds?
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1 mars
2 mercury |
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asthenoshere
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is a fluid subsection of the upper mantle
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lithosphere
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uppermost solid part of the mantle and the crust
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convection cells
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a circular type of convection current
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tectonic plates
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sections of the lithosphere that flotes ontop of the asthenosphere
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what r the 2 main ways the asthenosphere differ from the lithosphere
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1 the asthenosphere is much more fluid
2 they are chemiclly different |
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why are convection currents important
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they move part of the lithosphere
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what are the 4 main examples of fossil evidense to support the theory of plate tectonics?
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1. glossopterous
2. mesosarus 3. lystrosaurus 4. cynognathus |
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describe mesosaurus-when it lived, what type of animal it was ,whitch continents it is found in
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300 mya, fresh water reptile, south america, africa
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describe glossopteris- when it lived , what type of plant it was , which main continents and contrises was it found in
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300-250 mya, fern,africa, antartica,south america, india austrailia
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describe cynognathus- when it lived , what type of animal was it ,which maincontinents it is found in
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245-230 mya,mammal likereptile,aisia
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extant
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a specheses that is alive today
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rock sequences
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the order of rock layers when they are in sedements
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list the order of the four fossils chronicly, starting whith the earliest first
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1. mesosaur
2. glossoperous 3. lystrosaurus 4. cynognathus |
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which of the 4 fossils is a plant
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glossopterous
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which of the 4 fossils is animmal like
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cynogathus
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what kind of enviorment/climate is usually best for a reptile?
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warm
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what kind of climate is usually best for a fern
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warm
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which 3 types of animmals are extant evidence of pangeas existance?
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1. earthworms
2. flightless birds 3. marsoupeals |
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what does the glacial evidance indicate
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that they were all connected in 1 large supper-continent
anarticas glaciers started in africa |
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how is the glaciers formation related to the first mass extinction
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the glaciers made the sea levals drop and so 95% of all speicies went extinct
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durring which time did the first mass extinction happen
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paleozoic
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