A Decrease in the Ozone Layer and a Subsequent Increase

question 71

Multiple Choice

A decrease in the ozone layer and a subsequent increase in the UV radiation reaching the Earth's surface is a significant factor in the increasing number of cases of human

• A)lung cancer.
• B)tuberculosis.
• C)stillbirths.
• D)skin cancer.
• E)malaria.

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Definitions:

S-Cam Actuated Brakes

A type of drum brake system where an S-shaped cam is used to push brake shoes apart and against the brake drum to stop a vehicle.

Wedge Brakes

An air foundation brake system in which an air chamber forces a wedge between brake shoes forcing them into a brake drum to effect retarding force. Wedge brakes are usually actuated on both sides (unlike S-cam brakes) and so have higher theoretical braking efficiencies.

Maintenance Costs

The expenses associated with keeping an item, equipment or property in its best operating condition, including repairs, replacements, and routine check-ups.

Dry Cement

A powdery substance made by calcining lime and clay, used with water to make concrete, mortar, or plaster.