8

 32

 4

 16

  Giuseppe Mercalli

 Charles Richter

 Hiram Walker

 Joshua Rumble

  Flash

 Factor

 Force

 Field

  Cyclotron

 X-ray machine

 Nuclear reactor

 Betatron

  Moves in opposite direction in which the air is blown

 Does not move

 Moves in the same direction in which air blows

 Spins around

  W. Histell

 F. Whittle

 C. Lindbergh

 B. Owings

  The density of milk increases

 It becomes more viscous

 The density of milk remains unchanged

 The density of milk decreases

  Protoderm

 Extrastelar cambium

 Lateral meristem

 Provascular tissue

  Atmosphere

 Light

 Chlorophyll

 Soil

  500 m

 125 m

 250 m

 62.5 m

  Iron pyrites

 Gypsum

 Chlorapatite

 Coal

  Alpha rays

 X-rays

 Gamma rays

 Beta rays

  They emit light of a constant intensity

 Their distance from the earth does not change with time

 They are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable

 They are very far away from the earth resulting in decrease in intensity of light

  Electric resistance

 Voltage

 Power used by a current of one ampere

 Electromagnetic radio wave frequencies

  Hydrogen

 Natural Gas

 Ethanol

 Methane