SCIENCE 10 SUM

You were provided with data showing the arrival time of the P and S waves recorded from three seismic stations. Which of these can you possibly determine?

• the damage at the focus

• the distance to the earthquake

• the intensity of the earthquake

• the location of the epicenter

From the seismogram, the distance to the epicenter can be determined by measuring

• the arrival time of surface wave

• the difference in the arrival time of the P and S waves

• the ratio of the amplitude of the largest P and S waves

• the speed of the surface wave

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

• active volcanoes

• mountain ranges

• rift valleys

• volcanic islands

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

• denser than continental crust

• less dense than continental crust

• thicker than continental crust

• thinner than continental crust

___is the boundary between the Earth's crust and the mantle. It is defined by the distinct change in velocity of seismic waves as they pass through changing densities of rock.

• mohorovicic discontinuity

• mohorovicic continuity

• morohovicic discontinuity

• morohovicic continuity

Which of these is FALSE about crust plates:

• have the same thickness everywhere

• include the crust and upper mantle

• thickest in the mountain region

• vary in thickness

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

• convergent

• divergent

• reverse fault

• transform fault

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

• a few centimeters per year

• a few meters per month

• a few millimeters per century

• a few millimeters per day

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

• relatively young rocks

• reverse fault

• thick accumulation of sediments

• very ancient rocks

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

• linear sea

• oceanic ridge

• rift valley

• trench