The layers of the atmosphere are characterized by changes in . The troposphere experiences large changes in . Airplanes fly best in . The temperature in the troposphere as you go higher, and in the stratosphere, it as you go higher.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?