1) The composition of a magma evolves as it rises through continental crust. It\

Question

1) The composition of a magma evolves as it rises through continental crust. It's most accurate to say the magma's ______________.

Select one:

a. viscosity decreases

b. silica content increases

c. iron and magnesium content increases

d. temperature increases

e. water content decreases

2) Both a flood basalt eruption and a large meteor impact occurred ______________.

Select one:

a. at the end of the Precambrian

b. at the beginning of the Paleozoic

c. at the start of the Cenozoic

d. at the end of the Mesozoic

e. both c and d

3) In 1973, how did the folks in Heimaey, Iceland stop lava erupting from the fissure outside town from blocking the harbor entrance?

Select one:

a. They dug trenches to divert the flow.

b. They sprayed seawater to divert the flow.

c. They built cement walls to stop the advance.

d. They poured cement in the volcano to plug it.

4) Lava domes are associated with______________.

Select one:

a. mid-ocean ridges

b. volcanic arcs

c. hot spots

d. transform plate boundaries

5) Shield Volcanoes are generally associated with______________.

Select one:

a. mid-ocean ridges

b. volcanic arcs

c. hot spots

d. transform plate boundaries

Explanation / Answer

1. a

The composition of a magma evolves as it rises through continental crust. It's most accurate to say the magma's viscosity decreases.

2.e

Both a flood basalt eruption and a large meteor impact occurred during at the start of the Cenozoic and at the end of the Mesozoic.

3. a

All the new lava flow was channellized towards the harbor and closer and closer to the town.

4. b

Lava domes are associated with volcanic arcs

5.c

Shield volcanoes are the general product of hotspot volcanism.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.