EROSION
Nature is always changing. Those changes
are called natural events. Some natural events happen quickly. Think of a fire
that starts when lightning strikes a tree. Other events occur slowly, such as
when rocks are worn down over hundreds of years. Erosion(ih-ROH-jzun) is the
name given to that very slow change.
Moving water can cause erosion. Have you
ever seen wave crash against rocks on the shore? The water can chip off small
pieces of rock. As more waves hit the rocks, the pieces become even smaller.
Eventually, those pieces may turn into sand.
Ice can cause erosion. Some mountains have
solid sheets of ice near the top. During warmer weather a bit of ice melts.
Then the sheet of ice may move slowly down the mountain. As the solid ice
moves, it scrapes rocks, breaking into pieces.
Wind also causes erosion. Wind can blow
sand and dirt. It can carry the dirt far away. In some places, strong wind will
push sand against rocks. Over a long period of time, the wind wears down those rocks.
No comments:
Post a Comment