When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.
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Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.
Answer:
3000 hurs
Explanation: just divide 150000 by 50 and get 3000
