C atastrophism ; states that Earth's landscapes have been developed primarily by great catastrophes .
Features such as mountains and canyons were produced by sudden and often worldwide disasters .
U niformitarianism : one of the fundamental principles of modern geology advanced by James Hutton in the late 1700 s , states that : the physical, chemical, and biological operations that operate today have also operated in the geologic past .
The idea is often summarized as "the present is the key to the past“.
Formation of the solar system according to the nebular hypothesis.
The birth of our solar system began as dust and gases ( nebula )
The nebula contracted into a rotating disk
Cooling of the nebular cloud caused rocky and metallic material to condense into tiny solid particles .
Repeated collisions caused the dust-size particles to gradually gather into asteroid-size (star-like) bodies .
Within a few million years these bodies accreted into the planets .
1-8-2011 KSGI Dept of civil engg 10CV36
( ) Cooling of the nebula causes condensation of dust into solid particles. ( ) Accretion of planets. ( ) Contraction of the nebula into a rotating disk. ( ) The early solar system is a dust and gas cloud (nebula). Label the sequence of events describing the nebular origin of the solar system
The early solar system is a dust and gas cloud ( nebula ).
Contraction of the nebula into a rotating disk.
(C) Cooling of the nebula causes condensation of dust into solid particles.