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| aquifer |
a layer of rock, sand, or gravel that contains water from which wells and springs are supplied. |
| asphalt |
a mixture of this substance with gravel or sand, used to pave roads. [1/2 definitions] |
| beach |
the land at the edge of a lake, ocean, or other body of water. A beach slopes gently toward the water and usually has sand or pebbles. [1/2 definitions] |
| bedrock |
the solid layer of rock in the earth's surface, found beneath soil, sand, or gravel. |
| concrete |
a hard, strong building material made by mixing sand, gravel, cement, and water. [1/3 definitions] |
| delta |
a triangle of sand and soil deposited at the mouth of some large rivers. [1/2 definitions] |
| dig |
to make a hole by removing dirt, sand, or the like. [1/6 definitions] |
| dune |
a mound or hill of sand built up by the action of wind. |
| footprint |
a mark pressed by a foot onto a surface, such as a step in wet sand or a print left by a muddy shoe. |
| gravel |
a loose mixture of small stones, pebbles, and sometimes sand. |
| grindstone |
a stone wheel that is turned to sharpen knives and tools, grind grain, or sand and shape items by rubbing or scraping. |
| grit |
tiny rough bits of sand or stone. [1/3 definitions] |
| hourglass |
an instrument used to measure time that sends sand through a narrow opening between two larger glass bulbs. It takes exactly one hour for the sand to pass from one bulb to the other. |
| mortar2 |
a material made from lime, sand, and water and used to hold bricks or stones in place. |
| pan |
to wash gravel or sand in a pan to remove gold or other precious metals. [1/4 definitions] |
| pearl |
a smooth, round gem that is formed inside the shells of oysters. A pearl forms to cover something, such as a grain of sand, that gets stuck in an oyster and irritates it. |
| plaster |
a paste of sand, lime, and water that becomes hard when it dries. Plaster is used to cover walls and ceilings. [1/3 definitions] |
| quicksand |
a deep, wet, mixture of sand and water. Quicksand pulls down and swallows up a person or thing that stands on it. |
| reef1 |
a ridge of rock, sand, or coral at or near the surface of ocean waters. |
| sand |
to cover with sand or something like sand. [1/3 definitions] |
| sandbar |
a ridge of sand in a river or near a shore. It is formed by the action of waves or currents. |
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