Answer questions like ...

1. The pull of gravity is the same everywhere on Earth.
2. What proportion of the Earth’s land is covered by cities and urban areas?
3. Aerosols are tiny solid or liquid particles suspended in the atmosphere. How can large concentrations of aerosols affect the temperature of Earth’s atmosphere?
4. A phytoplankton bloom consists of a large number of microscopic plants floating on the upper, sunlit layers of the ocean. Such blooms indicate the onset of:
5. Which has more land: the Northern or Southern Hemisphere?