Land IS washed away in heavy rain and wind through the processes of weathering and erosion. The reason ALL of it is not washed away at once is because it takes considerable time for enough material to be weathered for it to be carried away by the rain and wind.
physical
There are many ways in which the rain erodes the land. The rain washes away dirt and wears down stone.
The soil will be easily washed away if there are no plants growing on it as it is the roots of the plants that hold on to the soil making it difficult to be washed away.
Hurricanes produces very heavy rain, which is why flooding is a major concern when they hit.
The water lubricates the rock, gravel, sand and mud so it slides downhill more easily
Flood is land that has been washed away by rising and overflowing bodies of water. Floods usually happen when there is heavy rain fall.
Plants with their root systems help prevent the surrounding soil from being washed away.
It's because of the angle of the land. Land on a mountain side is more sloped than in the low-lands or valleys, hence making it more prone to erosion (or being "washed away").
Soil can be harmed by depleting it of nutrients by over farming, washed away by rain, blown away by wind, contaminated by chemicals, oil, or heavy metals, or by just building over it.
Vegetation, such as grasses, shrubs and trees help to cover and protect soil from being washed away by heavy rain.
sand
Example: anthrax from chicken farms is dumped into lakes and washed around on land by rain. Now, the lake and every body of water it touches is poisonous. And if the anthrax is washed away by rain it can leak to a farm and make all of the crops poisonous to eat.
Heavy rain washed off the nutrients from the rainforest's soil.
When trees are cut down, the soil is washed away by heavy rain as there are no tree roots to hold the soil down
sand
After heavy rain came a thunder storm will come and sweep you away to pen island.com
the rain washed it away :D there was a storm when he died