Mountains are the highest places on Earth .Some are so high that their peaks are hidden by the clods.Many mountains are rocky and jagged ,with deep volleys.Others are smaller and more rounded.The higher up a mountain you go,the colder and windier it is.Trees cannot grow above a certain height,Known as the tree line.Further up high mountains. There is snow on the ground all year .Mountain goats have specially adapted hooves so that they can scramble up and down the steepest mountainsides without slipping.Like all mountain animals ,the alpine hare has a thick coat of fur to keep it warm.