____13. All of these are causes of soil erosion except one.

A. Fire C. Water

B. Human and animal activities D. Wind

____14. Which is the most effective agent of erosion?

A. glaciers C. water

B. gravity D. wind

____15.The process that moves sediments

A. Erosion C. Dissolution

B. Fracture D. Weathering

____16. Landslides on mountain slopes show the force of _______.

A. Gravity C. Running water

B. Runoff D. Wind

____17. What makes the water muddy after a heavy rain?

A. The fine dust particles dissolved in water.

B. The gravel and sand carried by the water

C. The pebbles moved along with water.

D. The rainwater turned brown in color.

____18. Which of the following factors can affect soil erosion?

I. amount of vegetation in the area

II. speed and amount of running water

III. dryness and size and soil particles

IV. Slope of the land

A. I and II only B. III and IV C. I, II and IV only D. I,II,III and IV

____19. How can trees help prevent erosion?

A. The roots absorb the water at once .

B. The roots hold the soil firmly together.

C. The roots secrete acid, attacking the rocks.

D. The trees block the way of running water.

____20.The following statements tell about preparations before typhoon, EXCEPT.

A. Check the house for possible damage

B. Listen or watch storm advisories

C. Prepare flashlight and batteries

D. Store food for the family

____21.Strong winds of 60-100 kph is expected within 24 hours and classes in the

elementary and secondary levels are suspended. It describes ___________.

A. Signal No. 1 B. Signal No. 2 C. Signal No. 3 D. Signal No. 4

____22. If Storm Signal No. 4 is raised, the speed of the wind is at least:

A. 85 kph B. 100 kph C. 120 kph D. 186 kph

____23. Which statement is true about weather conditions?

A. Weather conditions do not change.

B. Weather conditions change from time to time.

C. Weather conditions are the same for one week.

D. Weather conditions are the same throughout the day.

_____24. What is the weather condition in the eye of a typhoon?

A. fair B. cloudy C. rainy D. windy

_____25. Which public storm warning signal is characterized by winds of greater than

100-185 kph?

A. 1 B. 2 C. 3 D. 4

_____ 26. It is the abnormal rising of water level resulting from a typhoon.

A. high tide B. storm surge C. tornado D. tsunami

____ 27. Which best describes a storm surge?

A. It is the expansion of the hurricane’s characteriz​