วันศุกร์ที่ 12 กุมภาพันธ์ พ.ศ. 2559

Space

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 spacetimeread more

Deserts

Deserts

Far from being barren wastelands, deserts are biologically rich habitats with a 
vast array of animals and plants that have adapted to the harsh conditions 
there. Some deserts are among the planet's last remaining areas of total 
wilderness. Yet more than one billion people, one-sixth of the Earth's population, 
actually live in desert regions. read more

Cave

Cave

cave or cavern is a hollow place in the ground, especially a natural 
underground space large enough for a human to enter. 
Caves form naturally by theweathering of rock and often extend deep
 underground. The word cave can also refer to much smaller 
openings such as sea cavesrock shelters,