Earth's Axis and Revolution (Grade 11 NSC Matric Geography): Flashcards
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Radiation
Radiation
Transfer of energy through electromagnetic waves
Solar radiation
Solar radiation
Energy from the sun
Terrestrial radiation
Terrestrial radiation
Long-wave radiation emitted by Earth
Convection
Convection
Warm air rises carrying heat upward
Two factors affecting solar radiation received
Two factors affecting solar radiation received
Length of day/night and angle of sun's rays
Sun angle at 90° effect
Sun angle at 90° effect
Energy concentrated in 1 sq metre, maximum heating
Parallelism of the axis
Parallelism of the axis
Earth's axis always points same direction; 23.5° tilt
Solstices dates
Solstices dates
21 June and 21 December
Equinoxes dates
Equinoxes dates
20 March and 22 September
Day/night length at equinoxes
Day/night length at equinoxes
Equal everywhere on Earth (12 hours each)