to suck up the water to store it
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The roots of a cactus plant spread just below the surface of the ground to quickly absorb any moisture that falls as precipitation. This adaptation allows the cactus to maximize water uptake during rare rainfall events in arid environments. Additionally, shallow roots help the cactus stabilize itself in the sandy or rocky soil typical of its habitat.
Phototropism is the type of growth that the desert cactus plant shows above ground. It grows in response to the high levels of heat and light in the desert. The above ground parts are called the shoots, and the below ground roots. The roots grow in response to the search for moisture in the soil.
Igneous rocks can be found both in the ground and above ground. Igneous rocks form from the cooling and solidification of magma or lava, which can happen below the Earth's surface (intrusive igneous rocks) or on the surface (extrusive igneous rocks).
Yes, igneous rocks can be formed both above and below the ground. When molten rock solidifies beneath the Earth's surface, it forms intrusive igneous rocks like granite. If molten rock reaches the Earth's surface and cools rapidly, it forms extrusive igneous rocks like basalt.
A cactus is deeply rooted and, even in a hot desert, there may be dampness below. Also, whenever it does rain, the cactus will store water in special cells that cause the cactus to swell. Another adaptation is that a cactus's covering is waxy to prevent water loss. While it may be hot during the day, temperatures can plummet at night.
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