science u4 qz2

Question 1

what are plate tectonics

Answer 1

theory that explains why and how continents move and is the study of features of the earths crust

Question 2

what is the lithosphere

Answer 2

the crust and ridged part of the mantle

Question 3

what is the asthenosphere

Answer 3

there planets ride and layer of the mantle

Question 4

what is the oceanic crust

Answer 4

dense and made of rock that is rich in iron and magnesium

Question 5

what is the continental crust

Answer 5

low density and made of rock rich in silica

Question 6

what are tectonic plates

Answer 6

meet each other is different times of boundaries these boundaries can be identified by studying earthquakes and volcanoes there two events happen in plate boundaries

Question 7

what are divergent plates boundaries

Answer 7

plates moves away from one another

Question 8

what are mid oceanic ridges

Answer 8

magma rises through surface when plats move apart the hot tower density magma sits height the surroundings seafloor

Question 9

what is the rift valley

Answer 9

plates that separatemost divergent bound located on ocean floor

Question 10

what is convergent boundary

Answer 10

two plates collide there 3 types of collisions

Question 11

what are ocean continent

Answer 11

more dense ocean lithosphere subducts under the less dense lithosphere forms subduction zone

Question 12

what is continent continent

Answer 12

a colliding edges thinker which causes uplift that forms large mountian range
`

Question 13

what is ocean ocean

Answer 13

the plate subducts inder the other forming deep ocean trenches

Question 14

what is the transform boundery

Answer 14

when two plates slide past one another often cause earthquakes

Question 15

what is the convection current

Answer 15

in the mantle circulating hot and cold current in the a

Question 16

what is the convection current

Answer 16

in the mantle circulating hot and cold current in the asthenosphere slowly move the tectonic plates

Question 17

what is the ridge push

Answer 17

as warmer less dense rock at the mid oceanic ridge cools gets moredense and slides downwards pushing the rest of the plate

Question 18

what slab pull

Answer 18

at the more dense plates subducts under the less dense plates as it pulls behind it

Question 19

what is the atmosphere

Answer 19

a blanket of gases surronding the earth

Question 20

how much of other substances are there in the atmosphere

Answer 20

1%

Question 21

how much oxygen is there in the atmosphere

Answer 21

21%

Question 22

how much of nitrogen is there in the atmosphere

Answer 22

78%

Question 23

what is the hydrosphere

Answer 23

all the water on the earth

Question 24

how much water is on the earth

Answer 24

71%

Question 25

how much of the water is salt

Answer 25

97%

Question 26

how much of the water is ice

Answer 26

69%

Question 27

what is the geoshpere

Answer 27

all forms of life in the above 3 spheres

Question 28

what is the nitrogen cycle

Answer 28

organsims use the nitrogen the build ptoteins to build cells the nirtogen must be alters of fixed before it can be used by most organsims

Question 29

what is the carbon cycle

Answer 29

carbon is essential for fuels and life process

Question 30

what is the short term cycle

Answer 30

plants make carb out of carbon dioxde then animls eat the plants and convery the carbon in the co2 which i realed into air

Question 31

what is long term cycle

Answer 31

carbon is stored in rocks under the groundin plant and animals remains in carbonate rocks

Question 32

what is the phosphorrous cycle

Answer 32

phosphorus is in the moecules that organism to build cels its cycle passes through all the shrees except the atmosphere since it is rarely a gas

Question 33

what is the water cycle

Answer 33

moves mostly back and forth between the hydrosphere and the atmosphere to chases in energy which causes phase changes can be abosrded into soil and stored temp in organsims