2 Choose the correct words. 1 They took CCTV pictures of the shoplifter while
she stole / was stealing CDs.
2 While the hackers created / were creating
a new virus, the FBI began an investigation.
3 The robbers were trying to steal an enormous
diamond when the police arrived/ were arriving.
4 He was walking in the forest when he found /
was finding a gun.
5 While the vandals were breaking windows,
someone called / was calling the police.
6 Thieves entered the house while everyone
slept / was sleeping.​

We study a lot of different subjects. There are mathematics, russian language, english language, geography, biology, history and etc. in our school. There are 5-6 lessons a day, 5 times a week. Physical training is my favourite subject. I like it, because i love doing sport. It makes me cheerful and healthy. I throw my stress out during our sport activities. I also like literature! It's a wonderful subject! I like it, because I love to read classic. This subject doesn't let us forget our great poets and writers. When I read classic literature I feel the past. I don't like physics. It's not really interesting for me. And sometimes i don't understand it at all. I think the most important subject is russian language. This subject teaches us to be  literate. It's so important to be aducated nowadays! If you write with mistakes, it will be hard for you to find a good job. 

1 What makes the tectonic plates of the Earth's crust move?

Scientists believe that one of the primary forces behind plate movement is thermal convection. Thermal convection is when heat from the core of the Earth is transferred to the surface of the Earth by the mantle. The mantle is the thick, mostly solid layer of the Earth between the crust and the core. Thermal convection works a lot like a pot of boiling water. Liquid rock near the mantle is heated and rises toward the crust. The rock near the surface is cooler and sinks back down toward the core. This forms the same type of convection current that causes the plates to move.

2. Is the Earth solid or liquid?

The Earth has both solid and liquid components, but it is mostly solid. The Earth's interior is composed of four layers, three solid and one liquid — not magma but molten metal, nearly as hot as the surface of the sun.

3. How hot is the center of the Earth?

Scientists have determined the temperature near the Earth's centre to be 6000 degrees Celsius.

4. What kind of earthquakes do you know?

There are two main types of earthquakes: natural and man-made. Naturally occurring earthquakes occur along tectonic plate lines while man-made earthquakes are always related to explosions detonated by man.

Sometimes people distinguish four different types of earthquakes: tectonic, volcanic, collapse and explosion.

    A tectonic earthquake occurs when the earth's crust breaks due to geological forces on rocks and adjoining plates that cause physical and chemical changes.

   A volcanic earthquake is any earthquake that results from tectonic forces which occur in conjunction with volcanic activity.

   Collapse earthquakes are small earthquakes in underground caverns and mines that are caused by seismic waves produced from the explosion of rock on the surface.

   An explosion earthquake is an earthquake that is the result of the detonation of a nuclear and/or chemical device.