Bedrock
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In geology, bedrock is the solid rock that lies under weathered rock and unconsolidated or loose superficial deposits in the near surface part of Earth's crust or the crust of another terrestrial plan
Soil with broken rock fragments overlying bedrock at Sandside Bay, Caithness, Scotland
Regolith
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Regolith is a blanket of unconsolidated, loose, heterogeneous superficial deposits covering solid rock. It includes dust, broken rocks, and other related materials and is present on Earth, the Moon, M
Surface of asteroid 433 Eros
Alluvial gravels in Alaska
This famous image of Buzz Aldrin's footprint taken during Apollo 11 shows the fine and powdery texture of the lunar surface.
Martian sand and boulders photographed by NASA's Mars Exploration Rover Spirit