Question 5 About how long ago did Pangaea exist? A 225 years ago B 2,250 years a

Question

Question 5

About how long ago did Pangaea exist?

A

225 years ago

B

2,250 years ago

C

225,000 years ago

D

2.25 million years ago

E

225 million years ago

Question 6

In the early 1900’s, Alfred Wegener was a key proponent of “continental drift”. Which of the following examples did he use to support this hypothesis?

Multiple answers: You can select more than one option

A

Matching topographic and geologic features

B

Convection plumes in the mantle

C

Fit of the Continents

D

Mid-oceanic ridges

E

Same terrestrial fossils on separate landmasses

Question 7

The process of seafloor spreading predicts that which of the following is true?

A

The oldest seafloor will be found at subduction zones.

B

The seafloor moves like a conveyor belt from spreading centers toward subduction zones

C

There is high heat flow from Earth’s interior into the crust at spreading center

D

Continents shift locations because they are embedded in moving plates.

E

All of the above

Question 8

Hurricanes are tropical cyclones characterized by winds whose strength reach ______________ per hour or higher.

A

190 km

B

60 km

C

119 km

D

90 km

E

200 km

Question 9

Seismic waves radiate through Earth’s interior and surface during earthquake.

A

True

B

False

Answered

Change your responses to resubmit

Question 10

Natural hazards are unavoidable, and so are natural disasters.

A

True

B

False

Explanation / Answer

5. Pangaea (series of supercontinents of Earth) existed - late Paleozoic and early Mesozoic Eras. It formed approximately 335 million years ago. Pangaea existed over 100 million years ago.

Ans: 225 million years ago

6. Alfred Wegener used the following criteria to support Continental Drift hypothesis, which are : Fit of Continents - South America & Africa, An Ancient Climatic Similarities, Fossil Evidences, Similarities of Rock Structures.

Ans: A, C, E

7. Seafloor spreading is the result of Mantle Convection, at divergent plate boundaries. The currents observed in mantle convection carries the heat from the lower mantle to the core of the lithosphere.

Ans: All of the above

9. Seismic waves are of 2 types: Body waves (P-wave & S-wave) and Surface waves (Love wave & Rayleigh wave). P-wave is the fastest and can travel through liquid medium. S-wave is slower and can travel through solid rock. Seismic waves travel through the interior of the earth which arrives through the surface resulting into the Earthquake.

Ans: True

10. Natural Disasters/ Hazards are unavoidable, because they are caused by climatic, geological, meteorological, hydrological occurances such as hurricane, tornadoes, volcanic eruptions, extreme temperatures, drought, landslides, etc; i.e. they all occur naturally. Natural hazards and Natural disasters, both are one and the same. so they are Unavoidable.

Ans: True

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