# Lesson video

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Hi, everyone, I'm Miss Reid and welcome to another Geography Lesson on mountains, volcanoes and earthquakes.

Okay, let's have a look at our lesson question.

So our second lesson question is, what are folds mountains? Well, in this lesson, we're going to be learning about mountain ranges across the world, and how they're formed.

We'll also learn about Ocean Trenches and how they are formed.

So for today's lesson, all you'll need, is a pencil, some paper and your brain.

You might also have an exercise book, that's fine too.

Please take a moment to clear away any distractions, including turning off the notifications on any apps or conversations you have running, if you know how to.

Finally, if you can try to find a quiet place where you won't be disturbed during the lesson.

Pause the video now, so you can get the things you need and try to find a quiet place to work.

Excellent, now you have everything you need.

Let's carry on.

So we are Geographers, and you'll remember that Geographers are types of scientists who study the earth and that's what we're going to be doing.

This includes the land, the physical features such as mountains.

But it also includes the people who live on the land.

And these are the human features.

In today's lesson, we're going to be thinking about mountains.

We're going to be asking how our fold mountains formed? And we're also going to be thinking about Ocean Trenches.

So a mountain range, is a series of mountains or hills that are in a line and are connected by high ground.

Mountain ranges are formed when tectonic plates collide.

Mountain ranges are formed when tectonic plates.

that's right, collide.

When are mountain ranges is formed? When tectonic plates collide, I want you to do the action with me.

Mountain ranges are formed when tectonic plates collide.

Very good.

Mountain ranges are formed when? you need to choose the correct answer, a.

Mountain ranges are formed when tectonic plates move past each other, b.

Mountain ranges are formed when tectonic plates move around each other, c.

Mountain ranges are formed when tectonic plates move away from each other, or d.

Mountain ranges are formed when a tectonic plates collide.

Pause the video now and choose the correct answer.

Did you remember? Okay, Let's check.

Pause the video now so you can tick or fix your answer.

Excellent, so now know that mountain ranges are formed when tectonic plates collide.

Now, you might know this already.

In fact I might ask you to shout out.

Do you know the name of the tallest mountain on earth? If you do, shout it out.

I can hear some of you saying Mount Everest.

That's exactly right.

The tallest mountain on a is called Mount Everest, and it is 8,848 metres tall.

What is the name of the tallest mountain on earth? Shout it out.

That's right, Mount Everest.

Now Mount Everest is in the Himalayas and that's a mountain range.

Now this mountain range, the Himalayas travels through North East Afghanistan.

I'm going to zoom in so you can see, and you'll see Afghanistan has been underlined so you can see where Afghanistan is.

The Himalayas also travelled through North Pakistan, Northern India, Nepal, China, and Bhutan.

Now Mount Everest specifically, the tallest mountain on earth is in Nepal.

And you can see that little red dot shows us exactly where Mount Everest is in Nepal.

Other big mountain ranges include, let's have a look at them, closer.

The Rocky Mountains, North America.

Repeat after me.

I can't hear you, you're going to have to speak a little bit louder.

The Rocky Mountains, North America, Your turn, much better, let's carry on.

The Andes, South America, your turn.

Great.

The Himalayas, Asia.

Great.

Now you know those mountain ranges.

I'm going to test you on your knowledge.

Where are the Rocky mountains? Put your finger on the continent and say out loud.

That's right, they're in North America.

Where are the Andes? Put your finger on the continent and say the name of the continent out loud.

That's right.

The Andes are in South America.

Where are the Alps? Put your finger on the continent and say the name of the continent out loud.

That's right there in the Alps.

Where are the Himalayas? Put your finger on the continent and say the name of the continent out loud.

Well done.

The Himalayas are in Asia.

Great work, everyone.

So, now we're asking how are fold mountains formed? Okay, listen carefully and look at the pictures to help you understand.

When two continental plates collide, it causes the two plates to crumple and wrinkle in the same way as if two cars had collided.

Lets go through that again.

When two continental plates collide, it causes the two plates to crumple and wrinkle in the same way as if two cars had collided.

And this is what creates fold mountains, because the land or the crust, is pushed up and it causes mountains to form.

Here is a question for you.

Fold mountains are formed when? a.

Two continental plates move away from each other, b.

Two oceanic plates collide, c.

Two continental plates collide, d.

An oceanic plate and a continental plates collide.

Pause the video now, and choose the answer that you think is correct.

Did you get that right? Should we check? It was c.

Fold mountains are formed when two continental plates collide.

Amazing.

Let's move on.

So, an example of a fold mountain region, is the Himalayas in Asia.

When the Himalayas were formed, the Indian plate and the Eurasian plate collided, both plates are continental plates.

What type of plates are they? Continental plates.

And so when they collided, they crumpled and wrinkled forming the Himalayas.

These two plates are still moving towards each other.

And so the mountains in this region are getting taller.

Mount Everest is growing by about 1 cm per year.

Complete the sentences.

Let's zoom in, within these sentences, there are some words missing.

Let's have a look at them.

The Eurasian plate and the Indian plate are moving.

each other.

The Eurasian plate and the Indian plate are examples of.

plates.

When two.

plates.

,they wrinkle, forming.

If plates continue to move toward each other, the mountains get.

Here are the key words.

Continental, taller, fold mountains, towards and collide.

You need to rewrite these sentences, including the correct word in the missing gaps.

You might need to use some of the words twice.

Pause the video now, and complete that task.

Let's see how you did.

Lets zoom in.

The Eurasian plate and the Indian plate are moving towards each other.

Pause the video now, so you can tick or fix that sentence.

Next sentence.

Let's have a look at it.

The Eurasian plate and the Indian plate are examples of continental plates.

Pause the video now, so you can tick or fix that sentence.

Next sentence.

When two continental plates collide, they wrinkle, forming fold mountains.

Pause the video now so you can tick or fix that sentence.

If plates continue to move toward each other, the mountains get taller.

Pause the video now so you can tick or fix that sentence.

How did you do? I'm sure you did very well.

And if you didn't manage to get all of those right, well done for correcting them.

So now we're thinking about Ocean Trenches.

Well, Ocean Trenches occur when two oceanic plates collide.

What type of plates are they? That's right, oceanic plates.

And Ocean Trenches occur when they collide.

Show me the action of colliding.

Very good.

When two oceanic plates collide, the heavier plates sinks below the lighter plate.

This process of sinking is called Subduction.

The process of sinking as called.

That's right Subduction.

The process of sinking is called.

well done.

Subduction.

Where the two pieces of crust collide, a deep trench is formed.

One of the plates sinks into the earths' mantle and as slowly destroyed.

Okay, here's a question.

Ocean trenches are formed when.

a.

Two continental plates move away from each other, b.

Two oceanic plates collide, c.

Two continental plates collide, d.

An oceanic plate and a continental plate collide.

Pause the video now, so you can choose the answer that you think is correct.

Let's see if you got the right answer.

Ocean trenches are formed when two oceanic plates collide.

Pause the video now, so you can tick or fix your answer.

Excellent.

So, The Mariana Trench.

Now the deepest ocean trench is called, The Mariana Trench.

What's it called? That's right.

The Mariana Trench.

The Mariana Trench is East of the Philippines.

You can see it on the map, it's that red dot in the ocean.

The deepest part of The Mariana Trench is called The Challenger Deep, which is 10,809 metres below sea level.

The Mariana islands of volcanic islands.

You can see them in that rectangle there, that were formed due to magma escaping through vents, leading to the earth surface underneath the sea.

The islands were first formed under the ocean surface, but eventually grew to form islands above sea level.

Here's a question.

What is the name of the deepest Ocean Trench? Shout it out? That's right.

It's called The Mariana Trench.

Well done everyone.

So, that brings us to the end of today's lesson, a really big, well done, and all the fantastic learning you've achieved today.

If you're able to, please take a picture of your work and ask your parent or carer to share it with your teacher so they can see, all of the fantastic things you've learned today.