Space
This article is about the general framework of
distance and direction.
For the space beyond Earth's atmosphere,
see Outer space.
For the keyboard key, see Space bar.
For other uses, see Space (disambiguation)
distance and direction.
For the space beyond Earth's atmosphere,
see Outer space.
For the keyboard key, see Space bar.
For other uses, see Space (disambiguation)
Space is the boundless three-dimensional
extent in which objects and
events have relative position and direction
.[1] Physical space
is often conceived in three linear dimensions,
although modern
physicists usually consider it, withtime,
to be part of a
boundless four-dimensional continuum known
as spacetime. อ่านต่อ
Paper
Paper is a thin material produced by pressing together
moist fibres of cellulosepulp derived from wood,
rags or grasses, and drying them into flexible sheets.It is a
versatile material with...
อ่านเพิ่มเติม
Cave
A cave or cavern is a hollow place in the ground,[1][2] especially a
natural underground space large enough for a human to enter.
Caves form naturally by the weathering of rock and often extend
deep underground. The word cave can also refer to much smalle
r openings such as sea caves, rock shelters, and grottos. ...อ่านเพิ่มเติม
natural underground space large enough for a human to enter.
Caves form naturally by the weathering of rock and often extend
deep underground. The word cave can also refer to much smalle
r openings such as sea caves, rock shelters, and grottos. ...อ่านเพิ่มเติม
