Tsangpo canyon
Description: the deeper canyon in the world

a cldeira formation
Description: in "great naturals phenomenias" reader's digest editor

submarine muddy-run
Description: nature greats phenomenas, reader's digest ed.

cave
Description: science et vie junior editor

tropical hurricane
Description: in" greats nature's phenomemas"

karstic-upland
Description: science et vie junior editor

glacier
Description: formation basin, moraines, nose and circus

sun-electron way out
Description: science et vie junior editor

swel and delta
Description: Reader's Digest editor