Which of the following could represent the test variable in the experiment “the effects of cheap gasoline on fuel injectors”?

a. fuel injectors

b. gasoline

c. new cars

d. car engines

A. Fuel Injectors is the test variable, because it is the object that the experiment is being tested on, to determine the effects of cheap gasoline

satellites are frequently used to make observations of the orbit on earth

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.