INIS
planets
100%
power
60%
schools
40%
males
40%
coercion
40%
adolescents
40%
heat engines
38%
energy
38%
size
31%
engines
30%
humans
23%
heat
23%
children
20%
gain
20%
injuries
20%
usa
20%
sweden
20%
orientation
20%
websites
20%
range
20%
united kingdom
20%
legal aspects
20%
sun
19%
motion
19%
emission
19%
stars
15%
solar system
15%
air
15%
oxygen
15%
fuels
15%
atmospherics
15%
orbits
11%
water
11%
motors
11%
space
11%
oxidizers
11%
milky way
7%
zones
7%
venus planet
7%
jupiter planet
7%
mercury
7%
rockets
7%
data
7%
distance
7%
burns
7%
potential energy
7%
gases
7%
internal combustion engines
7%
hydrogen
7%
Earth and Planetary Sciences
Heat Engine
38%
Engine
30%
Earth
30%
Heat
19%
Definition
19%
Sun
19%
Fuel
15%
Emission
15%
Solar System
15%
Oxygen
15%
Extrasolar Planet
15%
Oxidizer
11%
Shape
11%
Water
11%
Size
11%
Atmospherics
7%
Observation
7%
Investigation
7%
Jupiter
7%
Emotion
7%
Sensory Feedback
7%
Hydrogen
7%
Chemical Energy
7%
Combustion Chamber
7%
Combustion Product
7%
Side
7%
Need
7%
Cause
7%
Air
7%
Mercury
7%
Distance
7%
Datum
7%
Time
7%
Orbit
7%
Trans-Neptunian Object
7%
Physics
Planets
84%
Engine
30%
Earth
30%
Stars
19%
Heat
19%
Motors
15%
Extrasolar Planets
15%
Oxygen
15%
Fuel
15%
Venus
15%
Emission
15%
Water
11%
Air
7%
Atmospherics
7%
Convection Cell
7%
Hydrogen
7%
Mars
7%
Distance
7%
Sides
7%
Internal Combustion Engine
7%
Natural Satellites
7%
Chemical Energy
7%
Earth's Gravity Field
7%
Habitable Zone
7%
Extrasolar Gas Giants
7%
Planetary Systems
7%
Jupiter
7%
Mercury
7%