If contact between quartz over long periods of time causes it to smooth, then what needs contact to smooth over long periods of time? Answer choices: - oxygen - soil - an object - h2o - rivers - quartz - cartilage - bamboo
quartz

(Question)
If ocean thermal energy can be used to produce electricity, then ocean thermal can be used to produce? Answer choices: - Temperature - electricity - warmth - steam - precipitation - friction - food and shelter - sun's heat
(Answer)
electricity

Ques: If playing is one way dogs learn to behave, then what is one way dogs learn to behave? Answer choices: - exercise - mating - ligt - playing - parties - slumber - firm hugs - Movement
Ans: playing

(Q).
If some plants have varied life cycles, then what have varied life cycles? Answer choices: - bacteria - fungi - Variety. - Cycles. - plants - Plants. - insects - Life of air.
(A).
Plants.

Ques:If global warming is when heat worldwide increases, then what is it called when worldwide heat increases? Answer choices: - global warming - threatened - acid rain - river pollution - climate - kinetic energy - global warmer - hyperthyroidism

Ans:global warming

Ques:If force is highest in arteries and lowest in veins, then is highest in arteries and lowest in veins.? Answer choices: - matter - voltage - Length - solutes - glucose - measure - Force - Joules

Ans:
Force