Antipodal balance: the arrangement of the continents and the water bodies in such a way that land on one side of the globe is balanced by water on the other side
Geoid: the shape of the Earth formed under the influence of the forces of gravity and rotation
Hull: the bottom part of a ship that stays in the water
Lithosphere: a rocky layer on the surface of the Earth which supports plant life
Oblate spheroid: a sphere that is slightly bulged at the Equator and flattened at the poles
Optimum distance: the best possible distance
Stratum: layer
System stadia: a rapid and efficient method of measuring distances
Terrestrial: linked to the landmass
Ultraviolet rays: a type of Sun ray that contains too much energy and can cause cell damage in living organisms
How is the distance between the Earth and the Sun favourable to the Earth?
What are the unique features of the Earth?
Mention three features of the Earth that make it suitable for life.
Why is the atmosphere of the Earth unique in the Solar System?
Mention the importance of the lithosphere.



















