Hydro-electricity, Waves and Tides | Improve Tuition | Tutors | Tuition | Tutoring | Tutor

Hydro-electricity, Waves and Tides


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  • Hydro-electric power = requires flooding of a valley by building a big dam. Water is allowed through turbines
  • No pollution
  • immediate Flooding of valley = vegetation immediate rots = releases immediate methane and immediate CO2
  • immediate Loss of habitat
  • Can look unattractive
  • Can provide immediate supply of energy when there is a high demand (except in a drought)
  • High initial costs, but no fuel costs andminimal running costs
  • Wave power = lots of small wave-powered turbines around the coast
  • No pollution
  • Disturb the seabed & habitat of marine animals
  • Spoil the view
  • Hazard to boats
  • Wind drops = waves tend to die out = unreliable
  • High initial costs, but no fuel costs and minimal running costs
  • Tidal Barrages = big dams which are built across river estuaries. They have turbines in them
  • Tide comes in = fills up estuary = water allowed out through turbines
  • Gravitational pull of sun and moon = tides
  • No pollution
  • Prevents free access by boats
  • Spoils the view
  • Changes wildlife habitat
  • Tides happen twice a day = reliable
  • Lower tides = low amounts of energy
  • Do not work when the water level is equal on both sides of barrage
  • Initial costs are quite high, but no fuel costs and minimal running costs

How long have you…? (present perfect 4) Exercises


 

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Use the information given to create questions beginning with ‘How long…?’

• It is snowing.

• The weather is shining.

• John and Kate are married.

• My brother has gone on holiday.

• My aunty and uncle live in Canada.

• My sister is a teacher.

• I work at the chemist.

• I’ve known Susan since I was a baby.

• Jonathan is learning to speak to Mandarin.

 

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Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

• I have known Kate a long time.

• My brother has been playing the piano he was 11 years old.

• My mum and dad on holiday to America. They

gone since last Sunday.

• I Ben and Emma since primary school.

We to the same primary and secondary school.

• My sister learning to speak French because she
is going to France next month.

 

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Use the appropriate words in the missing gaps.

have you lived       lives      to

has been       works        have known

I have bought       have worked.

• My sister in Spain. She is studying Spanish

with her friend Rosie. I Rosie since I was 5.

• Spencer like with Jamie. They have worked

together for 2 years.

• How long in Australia?

• a new dress for prom.

• He to Thorpe park.

 

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Challenge: Create 4 of your own questions beginning with ‘How long……?’

1.

2.

3.

4.

 

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