Geologic Features that occur along the Plate Boundaries

When two tectonic plates collide, the oceanic crust usually subducts beneath the continental crust because it is

• A. denser than the continental crust

• B. less dense than the continental crust

• C. thicker than the continental crust

• D. thinner than the continental crust

If you visit a place in the Pacific known to be along converging plates, which of these should you NOT expect to see?

• A. Rift valleys

• B. Active volcanoes

• C. Mountain ranges

• D. Volcanic islands

You are an oceanographer and want to map the ocean floor on the east coast of the Philippines. As you do your study, you notice that there is a portion in the ocean floor which is relatively much deeper than the rest. What most likely is that deeper part?

• A. Trench

• B. Rift valley

• C. Linear sea

• D. Oceanic ridge

What do you expect to find at a mid-ocean ridge?

• A. Reverse fault

• B. Very ancient rocks

• C. Relatively young rocks

• D. Thick accumulation of sediments

Crustal plate A is moving away from crustal plate B. What is the expected average rate of change in position between A and B?

• A. A few millimeters per day

• B. A few millimeters per century

• C. A few centimeters per year

• D. A few meters per month

Which plate boundary is formed between the Philippine plate and the Eurasian plate?

• A. Divergent

• B. Convergent

• C. Reverse fault

• D. Transform fault

Which of these is NOT true about the Philippine islands?

• A. Some are products of subduction process

• B. Originated geologically in an oceanic-oceanic convergence

• C. Formed because of the convergence of the Philippine plate and Pacific plate

• D. Most are part of the Philippine Mobile Belt, except for Palawan, Mindoro, and Zamboanga

Most of Earth’s earthquakes, volcanoes and mountains occur

• A. in the Himalayas

• B. at plate boundaries

• C. at volcanic island arcs

• D. in the center of continents

Complex mountain systems such as the Himalayas are the result of

• A. hot spots

• B. transform faults

• C. oceanic-oceanic convergence

• D. continental-continental convergence

At what type of plate boundary do plates move apart, resulting in the upwelling of material from the mantle to create new seafloor?

• A. Hot spot

• B. Divergent

• C. Convergent

• D. Transform fault