1. The rocks of the continental crust are largely compesd of: a. Mafic minerals,

Question

1. The rocks of the continental crust are largely compesd of:

a. Mafic minerals, denser than the minerals that make up the ocean crust

b. Basalt

c. Felsic minerals, less denser than those of the oceanic crust and upper mantle

d. Iron

e. Iron and nickel

2. Igneous rocks always occur in stratified layers or beds.

True / False

3. The two most common elements in earth's crust are magnesium and oxygen.

True / False

4.Itrusive ( plutonic) igneous rocks are usually coarsegrained and cool relatively slowly.

True / False

5. Which of the following is not common in an area where subduction is occurring?

a. The seafloor is spreading or "rifting"

b. Explosive volcanic activity and earthquakes are likely

c. A common feature is a deep ocean trench

d. Lithospheric plates are converging

6. The process of seafloor spreading, which produces new rock material on the surface, happens due to what type of tectonic force?

a, Concergence of lithospheric plates

b. Subduction

c. Divergence (rifting) of lithospheric plates

d. Gravity

7. The two major types of tectonic movement(or force) that result in distinctive landforms and faulting types are

a. Convergence and divergence( or rifting)

b. Subduction and lithification

c. Upthrow and downthrow

d. Gradation and erosion

8. The continental crust of the lithosphere is_______ than the oceanic crust.

a. Denser and thicker

b. Wider and lighter

c. Lighter ad thicker

d. Not different in density

9. The theory of plate tectonics and continental drift says that the lithospheric plates are floating in earth's:

a. Molten outer core

b. Upper solid mantle

c. Asthenosphere

d. Stratosphere

Explanation / Answer

1. The rocks of the continental crust are largely compesd of:

d) iron, iron is present in about 80% amount

2. Igneous rocks always occur in stratified layers or beds.

false, they can also be found on unstatified areas

3. The two most common elements in earth's crust are magnesium and oxygen.

false, they are iron and aluminium

4. Itrusive ( plutonic) igneous rocks are usually coarsegrained and cool relatively slowly.

true

5.Which of the following is not common in an area where subduction is occurring?

a. The seafloor is spreading or "rifting"

6. The process of seafloor spreading, which produces new rock material on the surface, happens due to what type of tectonic force?

c. Divergence (rifting) of lithospheric plates

7. The two major types of tectonic movement(or force) that result in distinctive landforms and faulting types are

a. Convergence and divergence( or rifting)

8. The continental crust of the lithosphere is_______ than the oceanic crust.

b. Wider and lighter

9.The theory of plate tectonics and continental drift says that the lithospheric plates are floating in earth's:

d. Stratosphere

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