Complete the notes. Write ONE WORD ONLY in each gap.
Marine renewable energy (ocean energy)
Introduction
More energy required because of growth in population and 31.
What’s needed:
● renewable energy sources
● methods that won’t create pollution
Wave energy
Advantage: 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 energy
Tides 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 harm fish and birds, e.g. by affecting 40. and building up silt
Ocean thermal energy conversion
Uses a difference in temperature between the surface and lower levels
Water brought to the surface in a pipe
