A mountain is a landmass that stands much higher
than the surrounding area. In Britain, for example, a mountain (1)
(is defined) as a hill that reaches at least 600 meters above sea level.
Most mountains (2) (were created) when tectonic plates collide, causing the
land to rise. The uplifted land (3) (was eroded) into peaks and valleys. The
appearance of most mountains is due to the effects of erosion by wind,
water or ice. For example, since the Himalayan mountains (4) (were formed)
millions of years ago, the peaks (5) (have been shaped) by the powerful erosion of
glaciers. Even near the equator, high mountains (6) (are covered) with snow
all year round. The peaks of Mount Kenya Kilimanjaro and Mount (have been sculpted)
by ice since they were born.