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When water is able to enter rocks, it is because they are permeable. Permeable rocks either have spaces (pores - porous rocks, e.g. sandstone), or paths through their structure (pervious rocks, e.g. limestone). These features can only be found in sedimentary/clastic rocks. Clastic means that it is made up of small particles cemented together, which gives it a grainy texture.

Metamorphic and igneous rocks are crystalline, which mades them impermeable because the crystals interlock, blocking a flow of water.

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