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Galley Hill Primary School, Hemel Hempstead. Galley Hill rated GOOD by Ofsted. Value of the Month - PERSEVERANCE

Wednesday

Spelling - We are going to continue with our work on the -le words.

Take a look at some of these games today.  Can you use the rules to help you?  

https://www.spellzone.com/word_lists/games-1650.htm 

Activity: Use the Look Say Cover Write Check method to practise you spellings.  Remember to talk about the rules that you have learnt and identify any of the tricky bits.  Make sure you correct any errors so that you don't remember the wrong spelling!

Earthquakes

 

Two weeks ago, we had a lesson called ‘Under Our Feet’, where we thought about the ground beneath us and what is there. Here is a picture to refresh our memories:

 

 

The crust: This is the outermost layer. The land we stand on is not just one solid piece. It is made of many pieces called plates. These plates fit together like puzzle pieces.

 

The mantle: This the widest part. It is extremely hot and is consists of semi-molten magma.

 

The outer core: This area is made of iron and nickel. It is very hot!

 

The inner core: This is the warmest layer. Temperatures can reach 5,500°C. 

 

 

The Earth’s Tectonic Plates

 

 

 

The Earth’s plates are always moving. They move so slowly that we usually can’t feel it. 

The edges of plates are called faults. Faults can rub together, push toward each other, or pull away from each other. 

Have a look at the Earth’s plates. What do you notice about where New Zealand is?

 

Last week I asked you to use two pieces of card, or the flat of your hands to move around and discover the ways in which the tectonic plates can move:

 

 

These movements can cause earthquakes.

 

Where do earthquakes occur?

 

Look at the map. Earthquakes happen frequently in these areas. What do you notice about where they happen?

 

 

 

  • Click hereto watch a video about earthquakes.

 

In England, we do not have large earthquakes. Some very small ones are felt by people or measured by very sensitive equipment, but they do not cause any damage.

 

If we lived in a country that did have lots of earthquakes, we would always have to be prepared!

 

PLAN- You need to have an emergency plan at home and school.

Have your survival kit or getaway kit ready to go.

 

PRACTISE- At school we practise our emergency drills, we need to do this at home too.

Remember: COVER, DROP, HOLD!

 

FIND SAFE PLACES- Before an earthquake make sure you know where the safe places are – under a strong table, away from glass, in a doorway, near a wall...

 

You would also hear an alarm to tell you to get to safety which sounds like this

 

 

How do we measure earthquakes?

 

There are two main ways to measure the power of an earthquake.

Machines called seismographsmeasure the power of an earthquake at its epicentre on a scale called the Richter scale

 

Another measure is the Mercalli scale, and this is based on people’s observations during an earthquake.

 

 

If we use a bowl of water and drop a pebble into it (to create the eipcentre) we can see where the earthquake would be the strongest. Eventually, the ripples disappear as they don’t have enough energy to travel any further - the same is true of the shock waves that create an earthquake.

 

 

 

Mercalli Intensity

Effect

1

Felt by no-one.

2

Felt by very few people. Hanging objects may swing.

3

Felt by many but they don’t realise it is an earthquake.

4

Felt indoors by most people. Vibrations similar to a lorry hitting a building.

5

Felt by nearly everyone. Sleeping people may be woken. Trees and telegraph poles sway.

6

Felt by all. People run outside. Furniture moves. Slight damage to property.

7

Felt by all. People run outside. Moderate damage to buildings

8

Specially designed buildings damaged, others collapse.

9

All buildings damaged. Cracks appear in ground.

10

Many buildings destroyed. Ground is badly cracked.

11

Almost all buildings destroyed. Wide cracks in the ground. Water, gas and electric out of action.

12

Total destruction. Waves seen on the ground.

 

 

 

Your task

 

You will make a seismograph to measure an earthquake. It’s important that your seismograph doesn’t move in the wind!  We don’t want any false readings.

 

You may use anything you can find in your house to build your seismograph.  Once it’s built, get as many people as you can to jump up and down to make the floor move and vibrate and see if you can get a good reading on your seismograph.

 

Good luck!

 

  

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