Answer:
do u mean I have to answer all the questions
Fire is important because it cooked food, provided light and provided heat
The vast pollution which occurs globally can have a significant impact on air quality on a local scale. The reason for this is quite simple: polluted air can easily get trapped beneath a cloud cover, or be literally "blown" away to other locations, and when much polluted air gets accumulated, it can have devastating heath effects on a local population, not just to humans, but to animals and plants as well. Overall, the vast global pollution can effect the smallest of regions on an unprecedented scale.
Ocean tides are the result of differences in the gravitational force between
the sun and the Earth's near side and far side, and ditto for the moon.
If the sin 30° = 0.5, then the cos 60° = 0.5
