40 points correct answer
why does hot air rise and cold air sink?

a ) cold air has more kinetic energy than hot air.

b ) hot air has more potential energy than cold air.

c ) cold air is more dense than hot air.

d ) hot air is more dense than cold air.

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

Talia is manufacturing rolls of wire for hanging pictures. she needs a material that is so that it can easily be pulled into wire without breaking.

Select the correct answer. what does the process of natural selection involve?