Assessment Direction: Read Each Item Carefully And Choose The Letter Of The Correct Answer., 1. Whic

ASSESSMENT Direction: Read each item carefully and choose the letter of the correct answer.

1. Which layer of the earth contains rocks that are moving slowly but continuously?

A. Crust
B. Mantle
C. Inner core
D. Outer core

2. What happens to the P-waves when they are approaching the molten part of the Earths interior?

A. become slower
B. remains the same
C. they disappear
D. the velocity increases

3. What do you call the region on Earths surface where a violent earthquake is felt?

A. Crust
B. Epicenter
C. Focus
D. Plate tectonic

4.Which of the following seismic waves is detected first by the seismograph?

A. L-waves
B. P-waves
C. R-waves
D. S-waves

5. Which part of the Earth is said to be solid?

A. Crust
B. Mantle
C. Inner Core
D. Outer Core

6. Why do scientists uses seismic waves in studying the composition of the interior of the Earth?

a. because seismic wave release materials from within the earth.

b. because seismic change radioactive decay rate of rocks.

c. because seismic wave travel at different rates at different materials.

d. Because seismic wave travel through the earth at a constant velocity.

7. Which is NOT true about seismic waves?

a. Seismic waves are generated during an earthquake,

b. Seismic waves travel only in an epicenter that is highly populated.

c. P waves travel faster than both S waves and surface waves.

d. Speeds of seismic waves changes at different densities of materials

 

Answer:

1.

2.a

3.

4.

5.d

6.c

7.c

Explanation:

1.the mantle

2.slow down P waves and stop S waves

3.its called epicenter

4.its called P-waves

5.outer part of the earth

6.they learning rates and speed

7. because,P waves slow down and stop S waves