Unit 2

Lesson 2: Conversation

So, Alex...You play the guitar.	play_circle pause_circle
Yes, I play really well. I can sing, too. I've got a great voice.	play_circle pause_circle
Really?	play_circle pause_circle
And I write songs. They're fantastic.	play_circle pause_circle
Hmm...Can I hear one?	play_circle pause_circle
Ok. What did Alex say?	play_circle pause_circle
He said he played the guitar really well.	play_circle pause_circle
Right. What else did he say? Can he sing?	play_circle pause_circle
Well, he said he could sing. He said he wrote fantastic songs, too.	play_circle pause_circle
And?	play_circle pause_circle
I heard one. It was terrible!	play_circle pause_circle
Ok. So we don't want him in our band.	play_circle pause_circle
Definitely not!	play_circle pause_circle
Listen 5 times	play_circle pause_circle

Energy from nature

Energy from nature	play_circle pause_circle
Energy is all around us	play_circle pause_circle
Power from the Earth	play_circle pause_circle
The Earth has natural energy.	play_circle pause_circle
This energy is renewable.	play_circle pause_circle
It never runs out.	play_circle pause_circle
The rocks under the ground are hot and liquid. They make heat.	play_circle pause_circle
The water in the oceans, rivers and seas is moving all the time.	play_circle pause_circle
Winds blow around the planet.	play_circle pause_circle
Using natural energy	play_circle pause_circle
Natural energy can turn a turbine.	play_circle pause_circle
People have used turbines for thousands of years.	play_circle pause_circle
Windmills and waterwheels are simple turbines.	play_circle pause_circle
A turbine is a machine that is turned by wind or liquid.	play_circle pause_circle
When it turns, it makes energy.	play_circle pause_circle
A generator makes this energy into electricity.	play_circle pause_circle
Recently, scientists and engineers from around the world met to discuss natural energy.	play_circle pause_circle
They said that they wanted to find new ways to use it.	play_circle pause_circle
They tried new ideas and now there are several ways using natural energy to turn turbines.	play_circle pause_circle
Wind	play_circle pause_circle
The wind turns the blades. These turn the turbine.	play_circle pause_circle
The generator makes electricity and sends this power along the lines.	play_circle pause_circle
Tides	play_circle pause_circle
The sea moves around coasts.	play_circle pause_circle
It moves towards the land then it moves away from the land.	play_circle pause_circle
These movements are called tides.	play_circle pause_circle
When the tide moves towards the land,the sea water moves some way up wide rivers.	play_circle pause_circle
Sometimes, a barrier is built across the river.	play_circle pause_circle
When the tide moves up the river, the energy in the water turns turbines and makes electricity.	play_circle pause_circle
When the tide goes out again, more energy is produced.	play_circle pause_circle
Water moves in many different ways on our planet.	play_circle pause_circle
The waves in the sea and the water in rivers and lakes can give us natural energy, too.	play_circle pause_circle
Power from the sun	play_circle pause_circle
The sun gives us heat and light.	play_circle pause_circle
Every minute enough energy arrives at the Earth to give us all as much power as we need for a whole year.	play_circle pause_circle
We have only learned how to use a tiny amount of it.	play_circle pause_circle
Solar cells	play_circle pause_circle
Solar cells make sunlight into electricity. They power satellites.	play_circle pause_circle
Many calculators are powered by solar cells.	play_circle pause_circle
Solar cells can put power into batteries.	play_circle pause_circle
Solar power stations	play_circle pause_circle
Solar power stations are built in hot, sunny places. This one is in California, USA.	play_circle pause_circle
Hundreds of mirrors are arranged around a tall tower.	play_circle pause_circle
As the sun moves across the sky, the mirrors turn so that they are always facing the sun.	play_circle pause_circle
The mirrors reflect sunlight onto the top of the tower.	play_circle pause_circle
It gets very, very hot.	play_circle pause_circle
Liquid salt at the top of the tower is heated by the sunlight.	play_circle pause_circle
The hot liquid is used to make steam.	play_circle pause_circle
The steam turns a turbine.	play_circle pause_circle
The turbine turns a generator.	play_circle pause_circle
The generator makes electricity.	play_circle pause_circle
Solar power stations are very expensive to build but the energy they use - sunlight - costs nothing	play_circle pause_circle
Listen 5 times	play_circle pause_circle