1. Why does the troposphere vary in thickness? A. Warmer air dissipates into the stratosphere. Cooler air is trapped in the troposphere.

B. Air turbulence in the troposphere varies the altitude.

C. Water vapor weighs down troposphere and less water vapor cause it to rise higher.

D. Cooler air contracts lowering the height, warmer air expands raising the altitude.

air, water, heat and noise pollution can all be caused by producing and using technology. consuming resources - non-renewable resources, including precious metals like gold, are used to make technology

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above