Complete the notes below.

Write ONE WORD ONLY for each answer.

Marine renewable energy (ocean energy)Introduction

More energy required because of growth in population and [1].

What's needed:

• Renewable energy resources

• Methods that won't create pollution

Wave energy

Advantage: waves provide a [2] source of renewable energy

Electricity can be generated using offshore or onshore systems

Onshore systems may use reservoir

Problems

• waves can move in any [3]

• movement of sand, etc. on the [4] of the ocean may be affected

Tidal energy

Tides are more [5] than waves

Planned tidal lagoon in Wales:

• will be created in a [6] at Swansea

• breakwater (dam) containing 16 turbines

• rising tide forces water through turbines, generating electricity

• stored water is released through [7], driving the turbines in the reverse direction

Advantages:

• not dependent on weather

• no [8] is required to make it work

• likely to create a number of [9]

Problems:

• may harm fish and birds, e.g. by affecting [10] and building up silt

Ocean thermal energy conversion

Uses a difference in a temperature between the surface and lower levels

Water brought to the surface in a pipe