fill in blanks

substances called blank are important because they act as a blanket to keep blank in our atmosphere. However , human actives can blank the concentrations of greenhouse gases in the atmosphere so much that they keep too thermal energy in the atmosphere. This causes global temperatures to blank which is a phenomenon called blank. This phenomenon is one contributing factor to changes in long term weather patterns known as blank.

answer key: greenhouse gases, global warming , global cooling , thermal energy, electrical energy, increase , decrease

substances called greenhouse gases are important because they act as a blanket to keep thermal energy in our atmosphere. However, human activities can increase the concentrations of greenhouse gases in the atmosphere so much that they keep too much thermal energy in the atmosphere. This causes global temperatures to increase, which is a phenomenon called global warming. This phenomenon is one contributing factor to changes in long term weather patterns known as global cooling.