Examlex
Most interstellar clouds remain stable in size because the force of gravity is opposed by within the cloud.
Oldest Unit
In geology, this refers to the earliest-formed rock or stratum in a sequence, indicating the beginning of the geological history of an area.
Bedrock
The solid rock layer beneath the surface soil and loose materials, forming the foundation for the Earth's surface landscapes.
Steep Mountain Front
A steep mountain front is a pronounced topographical feature where the slope of a mountain is dramatically steeper, often marking the boundary between differing geological formations.
River
A large, natural stream of water flowing in a channel to the sea, a lake, or another such stream.
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