Geomorphology and the Earth
The Earth: origin, rotation and revolution
Practise 5 PYQsConcepts to cover
- Origin of the Earth: Big Bang, nebular hypothesis and planetesimals
- Evolution of the atmosphere and oceans by degassing
- Rotation and revolution: day and night, the year, aphelion and perihelion
- Axial tilt of 23.5 degrees, solstices, equinoxes and the seasons
- Variation of day length with latitude and season; midnight sun at the polar circles
- Finding direction from the Pole Star and the Sun
- Geological time scale: eons, eras and periods