What Causes an Oasis in the Desert?
An oasis is a fertile spot in the middle of a desert, an island of life in an ocean of temperature extremes. Any oasis always contains one or more springs. Oases make it possible to survive long treks through the desert. In large deserts such as the Sahara, towns cluster around sources of water such as oases and rivers. What causes an oasis? An oasis is actually a spot in the desert where the elevation is low enough that the water table is right underneath the surface, resulting in the presence of springs. Even in a desert, it rains occasionally, and this produces a water table just above the bedrock, usually several hundred feet below the surface. Sand is very porous, so most water runs right through it and down to the bedrock. Deserts consist of many millions of tons of sand. There is only one natural force capable of moving it in appreciable amounts – the wind. Although, in an average dust storm, a ten cubic feet (3.05 cubic meters) of air only hold about an ounce of sand, a cubic m
An oasis is a fertile spot in the middle of a desert, an island of life in an ocean of temperature extremes. Any oasis always contains one or more springs. Oases make it possible to survive long treks through the desert. In large deserts such as the Sahara, towns cluster around sources of water such as oases and rivers. What causes an oasis? An oasis is actually a spot in the desert where the elevation is low enough that the water table is right underneath the surface, resulting in the presence of springs. Even in a desert, it rains occasionally, and this produces a water table just above the bedrock, usually several hundred feet below the surface. Sand is very porous, so most water runs right through it and down to the bedrock. Deserts consist of many millions of tons of sand. There is only one natural force capable of moving it in appreciable amounts — the wind. Although, in an average dust storm, a ten cubic feet (3.05 cubic meters) of air only hold about an ounce of sand, a cubic
An oasis is a fertile spot in the middle of a desert, an island of life in an ocean of temperature extremes. Any oasis always contains one or more springs. Oases make it possible to survive long treks through the desert. In large deserts such as the Sahara, towns cluster around sources of water such as oases and rivers. What causes an oasis? An oasis is actually a spot in the desert where the elevation is low enough that the water table is right underneath the surface, resulting in the presence of springs. Even in a desert, it rains occasionally, and this produces a water table just above the bedrock, usually several hundred feet below the surface. Sand is very porous, so most water runs right through it and down to the bedrock. Deserts consist of many millions of tons of sand. There is only one natural force capable of moving it in appreciable amounts ?the wind. Although, in an average dust storm, a ten cubic feet (3.05 cubic meters) of air only hold about an ounce of sand, a cubic mi
