以"the earth"为题写一篇英语小作文

The earth
Of all the planets in our universe,there is only one we know can suppout life.Just the right distance from the sun with a perfect climate.It’s been called the lucky planet.About five billion years ago,a huge asteriod crashed into the earth tilting it at an angle of exactly 23 and a half degrees to the sun.This cataclysmic accident turned out to be nothing short of a miracle.Without that crucial tilt,everything would have been different.For it created the seasons,the extremes of climate,hot and cold,and landscapes of spectacular beauty.
The perfect conditions for life on Earth.All life on earth is built on chance and powered by the sun.But the delicate balances of our world are faltering,as the planet are struggling to support our growing demands.This is the time to take the stock of what we have and what we stand to lose.We follow a year on earth,joining our fellow creatures as they battle to raise their young in a world that is rapidly changing.
January,the high Arctic,and there has been no sun for over a month.At this time of year,it’s permenant night.Male polar bears are on winter patrol,but there is little to eat.Every living thing is just waiting.
February,and the sun makes its first appearance over the horizon.This female bear has been underground in her den the whole winter.She toboggans down the slope.Perhaps just to clean her fur,but looks like sheer joy.She hasn’t been alone down there.Her cubs were born underground.They are two months old,but this is the very first time they’ve seen the light of day.They’re drawn to their mother’s calls,but these slopes are not the easiest place to take your first step.
The cubs haven’t been fed this morning.The mother has delayed their first meal on this special day.Hunger will draw them to her.It’s the beginning of their training.
Milk is the only food the cubs have known since they were born deaf and blind beneath the snow.The mother hasn’t eaten for five months,and has lost half her body weight.She’s giving the last of her reserves to her cubs.She can’t leave yet for search of her food.She’s trapped on these slopes until the cubs find their feet.It’s a trial female bears have always endured.Every year this time,female bear needs food desperately.They know they must get down to the hunting ground under the ice.What they can’t know is there is a problem waiting for them there.A new problem.

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