Hydroelectric energy is based on the blank energy of water being converted to blank energy as waterfalls and pushes against the turbine

this is wrong the correct answer is potential to kinetic.

because think about it... the water has potential energy to fall when its at the top of a waterfall. and as it falls it losses potential and gains kinetic energy, and with that kinetic energy the water hits the turbine and kinetic energy is turned into electrical energy. THUS, MAKING POWER!!!

your welcome.

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.

i think its d if wrong im sorry