Index

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

 

V

Vallis
A sinuous valley.
Vastitas
Widespread lowlands.
Vent
The opening in the crust through which volcanic material erupts.
Volatile
Compounds with low melting temperatures, such as hydrogen, helium, water, ammonia, carbon dioxide and methane.
Volcano
(1) A vent in the planetary surface through which magma and associated gases and ash erupt. (2) The form or structure produced by the erupted materials.

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