Which of these examples most closely models the greenhouse effect? A
Turning on several fans at once can keep you cool in a heat wave.

B
Reinforced windows keep heat inside your house in the winter.

C
Opening the door lets the air conditioning out in the summer.

D
Lighting a fire keeps the drafty ski lodge warm when it’s snowing.

Hich of the following best summarizes the text’s depiction of the ancient indus valley cities (namely harappa and mohenjo-daro)? a. the cities were very plain and simple; the people did not focus on art and architecture, devoting their time instead to agriculture and the bare essentials. b. the cities were adorned, or decorated, with almost overwhelming displays of wealth and artistic architecture. c. the cities were extremely clean, relying on an advanced water and sewer system, though this was mainly constructed for the innermost areas of the cities. d. the cities were clean and peaceful, and they were designed in an extremely organized fashion, using an advanced water and sewer system to keep them this way

Explain why components that are naturally found in air can be considered air pollutants.

How does the parallax of a nearby object compare to that of an object farther away?