Ozone-Depleting Chemicals Are Most Efficient at the Poles, Both for Arctic

question 11

Multiple Choice

Ozone-depleting chemicals are most efficient at the poles, both for Arctic and Antarctic regions. The major reason for this is:

• A) lots of CFCs are used in polar regions.
• B) tourists there pollute the atmosphere.
• C) very cold winters.
• D) all the ozone is formed over the equator and none reaches the poles.
• E) a lack of stringent air pollution laws at the poles.

Comprehend the motivations and impacts of key individuals and groups in the western expansion.

Recognize the role of federal policies and actions in shaping the West, including the creation of the Bureau of Reclamation.

Identify and analyze the myth versus reality in the portrayal of the American West.

Grasp the significance of natural resources and entrepreneurial ventures in the development of the West.

---

Definitions:

Snap Rings

Circular, semi-flexible metal rings with open ends that fit into grooves and are used to secure components on shafts or in housing.

Gasket-Type Seals

Devices designed to prevent the leakage of fluids between two surfaces by filling the space between them, typically made of flexible materials.

Trapezoidal

A shape or form characterized by a four-sided polygon with at least one pair of parallel sides.

Cross Section

A view or drawing that shows what the inside of something looks like after a cut has been made perpendicular to its axis.