Process: - Greenhouse gases are released into the air by human activities - The earth changes energy from the sun into heat - Heat rises from the ground - Greenhouse gas molecules in the atmosphere prevent the heat from going into space - The temperature of the earth increases - The temperature continues to rise and melts the polar ice caps - The temperature rises even faster.  Question: suppose global economic recession forces plants to close happens, how will it affect a SMALLER greenhouse effect.  - A: more - B: less - C: no effect
Ans: A

Process: - Muscles work by expanding and contracting - A muscle fiber gets a signal from its nerve - Proteins and chemicals release energy to either contract the muscle or relax it - When the muscles contracts the bones connected to he muscle are pulled closer together - When the muscle relaxes the bones move farther apart.  Question: suppose the muscles receive more chemicals happens, how will it affect The muscles being pulled closer to the bones.  - A: more - B: less - C: no effect
Ans: A

Process: - Limestone is located under the soil - Rain picks up carbon dioxide as it falls to earth - The rain falls on the soil over the limestone - The carbon dioxide in the rain washes through the soil - The carbon dioxide turns into acid - The acid in the rain gets to the limestone below the soil - The acid dissolves the limestone - Acid continues to erode the limestone with more rain over time - The eroded limestone sometimes forms caves.  Question: suppose there is more rain happens, how will it affect LESS or SMALLER caverns.  - A: more - B: less - C: no effect
Ans: B

Process: - The air is cold - Water is in the air - The water forms tiny ice crystals - The ice crystals collide with each other - The ice crystals stick to each other - The ice crystals get bigger as more of them stick together - The ice crystals get too heavy to be in the air - The ice crystals become snowflakes - The snow flakes fall to the ground as snow.  Question: suppose more aluminum reaches the waterways happens, how will it affect more ice crystals get heavy.  - A: more - B: less - C: no effect

Ans: C