Explain how heat in the Earth’s crust can be used to generate electricity in a geothermal power station

(cold/oxygen/warm/Peru) In a normal year cold (1) upwells off the coast of (2) in South America. This water is rich in nutrients,carbon dioxide & (3). In an El Niño year the flow of water reverses and a (4) current replaces the (5) current

The average radius of the Earth is 6400 km. Use the information on the diagram to calculate the approximate thickness of the Earth’s crust.

Name the three main types of rock found in the Earth’s crust.

The populations of megacities are growing faster in developing countries than in developed countries as a result of push and pull factors. Explain what is meant by the terms push factor and pull factor.

Suggest disadvantages of solar power as a source of energy. (3)

Name the two continents where there has been no change in the number of megacities between 2005 and 2015.

Geothermal energy can be one benefit of living near a volcano. Suggest other benefits of living near a volcano.

Calculate the total percentage of greenhouse gas emissions from the developing countries that are named in the pie graph.

Describe two environmental problems caused by rapid population growth in cities.

Name the country responsible for almost one quarter of global greenhouse gas emissions in 2012.

Calculate the percentage increase in megacities in Asia between 2005 and 2015. Show your working.