SECTION 4
Questions 31-40Complete the form below.
Write
ONE WORD for each answer.
Marine renewable energy (ocean energy)
IntroductionMore energy required because of growth in population and
31 What’s needed:
● renewable energy sources
● methods that won’t create pollution
Wave energyAdvantage: waves provide a
32 source of renewable energy
Electricity can be generated using offshore or onshore systems
Onshore systems may use a reservoir
Problems:● waves can move in any
33 ● movement of sand, etc. on the
34 of the ocean may be affected
Tidal energyTides are more
35 than waves
Planned tidal lagoon in Wales:
● will be created in a
36 at Swansea
● breakwater (dam) containing 16 turbines
● rising tide forces water through turbines, generating electricity
● stored water is released through
37 driving the turbines in the reverse direction
Advantages:● not dependent on weather
● no
38 is required to make it work
● likely to create a number of
39 Problem:● may ham fish and birds, e.g. by affecting
40 and building up silt
Ocean thermal energy conversionUses a difference in temperature between the surface and lower levels
Water brought to the surface in a pipe