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Science 8th grade > February 11 Science quiz > Flashcards

February 11 Science quiz Flashcards

(94 cards)

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1
Q

What is the length of the mid-ocean ridge?

A

It is 65000 km long.

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2
Q

What does the mid-ocean ridge form?

A

The largest and longest mountain range on earth.

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3
Q

What percent of the mid-ocean is underwater?

A

I90% is underwater.

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4
Q

How deep is the mid-ocean ridge?

A

It is 2500m deep.

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5
Q

What kind of tectonic plate does the mid-ocean ridge form?

A

It is on a divergent plate.

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6
Q

What do volcanoes erupt?

A

It erupts basalt.

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7
Q

What does slow seafloor spreading cause?

A

It causes steep irregular topography.

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8
Q

What do faster-spread rates cause?

A

It causes wide and gentle slopes.

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9
Q

Where is the mid-Atlantic ridge?

A

It is in the center of the Atlantic.

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10
Q

How much does the seafloor spreading increase a year?

A

It grows about 3 to five centimeters a year.

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11
Q

What are some east pacific ridge facts?

A

Pacific ocean, fast spread, smooth volcanic summits.

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12
Q

How long is the mid-Atlantic ocean?

A

It is 65000 km long.

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13
Q

What part is the largest point of the mid-Atlantic ridge called?

A

It is called Iceland.

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14
Q

What are four continents that border the mid-Atlantic ridge?

A

South America, North America Eurasia, Africa.

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15
Q

When do convergent plate boundaries?

A

two plates collide into one another.

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16
Q

What occurs when plates move into another plate?

A

Earthquakes and volcanoes.

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17
Q

Ocean to the continent is ocean plate dancer so it will subduct, true or false?

A

It is true.

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18
Q

What happens at subduction zones?

A

Deep trenches.

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19
Q

What happens to the subducted plate?

A

It melts when it hits the mantle

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20
Q

What are examples of the continent to continent?

A

Japan, and North America.

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21
Q

What is happening when the transform plate boundaries?

A

It is sliding back and forth.

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22
Q

What is a famous transform fault?

A

It is San Andreas Fault in California.

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23
Q

In what way is the pacific plate moving?

A

It is moving north.

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24
Q

In what way is the North American plate moving?

A

It is moving south.

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25
What is not created nor destroyed?
crust plate.
26
What is the rock that was collected on Mout Everest?
grey limestone, yellow marble, and granite.
27
What is the ocean floor is what?
It is folding up under tremendous pressure.
28
Rock is what in the conveyer belt system?
It is called channel flow.
29
What causes the Himalayas to go up.
It is called uplift.
30
How many major earthquakes have the Himalayans over the last 100 years?
There have been 15 earthquakes.
31
What causes mountains to shrink?
Erosion, and weather.
32
What do cosmic rays act like?
They act like cosmic sunburn.
33
How much does mount Everest grow each year?
It grows.25 inches a year.
34
`Who came up with the idea of continental drift?
It was Alfred Wegner.
35
What does Pangea mean?
It means supercontinent.
36
When did the Pangea exist?
It existed millions of years ago.
37
What do continents fit together like?
They fit like puzzle pieces.
38
Where are mountain ranges formed?
On opposite sides of the Atlantic ocean.
39
Where is the midnight zone begin?
3300 feet deep.
40
What temperature is it in the midnight zone?
39 ferinhight.
41
How deep is the challenger deep?
It is 7035 feet deep.
42
What is the lowest point in the Mariana trench?
It is called challenger deep.
43
How long does it take to get to challenger deep?
It takes 20 minutes.
44
What are the deepest ocean trenches in the Pacific?
The deepest ocean trenches are called the Ring of Fire.
45
What is the more common ocean on the ocean, or continent to ocean?
It is more common to have a continent to the ocean.
46
How many tones are in challenge deep?
eight tons of pressure per square inch.
47
What were oceans originally called?
they were originally called deeps.
48
What is a trench in the seafloor?
It is called a topographic depression.
49
What shape is the seafloor called?
It is crescent-shaped.
50
What part of the ocean is closest to the center of the earth?
The Arctic ocean.
51
What is the tallest mountain from the base to the summit?
It is Mauna kea.
52
How tall is Mauna kea?
It is 10200m tall.
53
What does Everest have?
The highest altitude from sea level up?
54
What is the third factor to shape mountains is what?
It is climate.
55
What has been found in the Himalayas?
It is fossils of sea creatures.
56
What do the Himalayas mean?
It means home of the snow.
57
Is mount Everest named for a man who first claimed the Mountain?
No.
58
What was the first successful year to climb the peak of Mount Everest?
It was the year 1953.
59
What is the acronym for the layers of the earth?
Lost ants march over ice.
60
What is the compositional layer?
It is the oceanic and continental crust, mantle, and core.
61
Continental crust is what?
Thicker but less dense.
62
Oceanic crust is what?
It is thinner but denser.
63
What does the lithosphere include?
It includes all crust and upper mantle.
64
What is Asthenosphere?
It is sluggish and likes oobleck or toothpaste.
65
What is the outer core?
It is liquid.
66
What is the inner core made of?
It is made of Nickle and iron.
67
Who discovered continental drift?
Wegner.
68
What do convection cells do?
The rising and sinking of hot magma and it heats, it gets less dense and then cols and gets denser in the mantle.
69
What are the three types of plate boundaries?
Divergent, convergent, and transform.
70
What do divergent forms?
It forms mid-ocean ridges and seafloor spreading.
71
What do transform plates do?
They are a common reason for earthquakes because plates get stuck.
72
What do convergent plates form?
They create volcanoes and mountains and trenches.
73
What does subduction do?
It is when dense plates sink below the less plates sliding back into the mantle.
74
What does subduction do?
It recycles the earth.
75
What is the Marina trench about?
It is 7 miles at the deepest point, and temperature just above freezing, 3 hours to explore, In Pacific ocean, 5 people have gone down.
76
Who discovered seafloor spreading?
Harry Hess.
77
What are Appellation features?
rounded, colorful trees, 4 seasons, tallest peak, 6400 fr, Main to both Georgia and is 2,000 miles long and had wildfires.
78
What is Rocky Mountain features?
Canada to New Mexico, talkest peaks over 14000 ft, snow-capped, jagged, steep, lot os rivers/lakes, western US, and 3000 miles long, and has wildfires.
79
What are the Himalayas mountain features?
In Asia, where Indian and Eurasian plates crash, jagged and steep, many rivers are 20000 km long.
80
What do earthquakes cause?
They cause tsunamis and fires.
81
What did Karatoa do?
It erupted making the loudest noise recorded in history.
82
What did the Karatoa have on the effects on the ecosystem?
It cooled the temperature of the world and made the sun cover for five days.
83
What color sunsets did it make?
It made red sunsets.
84
What was the island that took karate as the place?
Anak Krakatoa.
85
Where do 90% of the world's earthquakes happen?
They happen in the Ring of Fire.
86
What causes earthquakes in Japan?
Ocean to ocean boundaries.
87
What percent of earthquakes happen in interplates?
5%.
88
Where are Nashville and Memphis near?
They are near the Madrid fault zone.
89
Can you have an earthquake without a fault?
No, you can not.
90
How many of the US states have moderate to high quake risk?
40 out 0f 50 states.
91
What state had the largest ever recorded earthquake?
Alaska.
92
How many minutes did the Sumatran earthquake last?
7 minutes.
93
Where are most volcanos found?
Most are found in the Ring of Fire.
94
What percent of volcanoes happen in the Ring of Fire?
75%.

Science 8th grade (6 decks)

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