3. The following materials are found in our surroundings. Which one of these is the best absorber of heat? oil b. juice c.rock d. water 4. What will happen to the particles of air when it is heated? expand b. explode c. float d. sink 5. Why does air sink? a. Because it has low density c. Because its temperature is low making it denser b. Because it has unstable density d. Because its temperature is high resulting it to less dense 6. Which of the following will cause wind or movement of air in our atmosphere? Differences in altitude c. Differences in temperature and altitude b. Differences in pressure d. Differences in temperature and pressure 7. What causes air to rise in the atmosphere? Increase of air pressure c. Decreases in temperature of air b. Increases in temperature of air d. Decreases of both pressure and temperature of air 8. Which of the following will occur in the atmosphere due to temperature differences of air? a. Melting of cool air c. Floating of warm and cool air b. Sinking of warm air d. Sinking of cool air and rising of warm air 9. What happens when air is heated? a. Stays in place C. Spreads in all direction b. Expands, then rise d. Moves toward a lower elevation ​