(Q).
Answer the following question given this paragraph: Cumulus clouds are white and puffy. Convection currents make them grow upward and they may grow very tall. When they produce rain, they are called cumulonimbus. Q: What causes cumulus clouds to grow upward? Choices: - moisture currents - gas currents - mantle currents - convection currents A:
(A).
convection currents

(Q).
Answer the following question given this paragraph: Lahars are mixtures of ash and water that travel down river valleys. On Mount St. Helens, the eruption melted glaciers. The water mixed with ash from the eruption and created tremendous lahars. The lahars raced down valleys and knocked out many bridges. Q: What do you call mixtures of ash and water that travel down river valleys? Choices: - debris - pollutants - mud slides - lahars A:
(A).
lahars

(Q).
Answer the following question given this paragraph: Bread has little holes in it from carbon dioxide produced by yeast. Q: Bread has little holes in it from carbon dioxide produced by what? Choices: - sugar - water - bacteria - yeast A:
(A).
yeast