Examlex
In mammalian eyes, light must pass through neural cells to reach the photoreceptors in the retina.
Limestone
A type of sedimentary rock, primarily composed of calcium carbonate, often formed from the remains of marine organisms.
Shale
A fine-grained sedimentary rock formed from clay and silt-sized particles, often easily split into thin, parallel layers.
Impermeable Layers
Geological strata that do not allow the passage of water or fluids due to their tightly packed nature.
Permeable Rocks
Rocks that contain pores or cracks through which fluids such as water can easily pass.
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