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

 

D

Density
Measured in grams per cubic centimetre (or kilograms per litre); the density of water is 1.0, iron is 7.9, and lead is 11.3.
Diaplectic Glass
A natural glass formed by shock pressure from any of several minerals without melting; it is found only in association with meteorite impact craters.
Dielectric Constant
The ratio of electric flux density to electric field.
Disk
The visible surface of the Sun (or any heavenly body) projected against the sky.
Doppler Effect
The apparent change in wavelength of sound or light caused by the motion of the source, observer or both.
Dorsum
A ridge.

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