A Thin Layer of Air, Water, and Soil Surrounding the Earth

question 52

Multiple Choice

A thin layer of air, water, and soil surrounding the earth is called__________

• A) ecology
• B) biology
• C) biosphere
• D) ecosphere

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Definitions:

Marginal Cost

The increment in total spending due to the manufacture of one more unit of a product or service.

Fixed Cost

Fixed Cost is a business expense that does not change with the level of goods or services produced within a certain period.

Variable Costs

Variable costs fluctuate with the level of output, increasing as production rises and decreasing as production falls.

Lawn-mowing

The process of cutting the grass in a yard or garden to maintain its appearance and health, often using a manual or motorized lawnmower.