25/02/2018 Newsround

Hey, guys.

I'm Naz,

and this is Newsround.

The Closing Ceremony of

the Winter Olympics has taken place.

There were lots of fireworks,

music and entertainment

as the athletes celebrated

the end of the 2018 Games.

Team GB came 19th in the medal

table - winning five.

Snowboader Billy Morgan

carried the flag.

Athletes from Russia

were not allowed to parade

under the Russian flag.

168 of them competed

at the Winter Games,

but under a neutral flag.

The country was banned

from the Olympics because of doping

at the last Games in Sochi.

It is thought the Russian Government

may have helped athletes take drugs

to give themselves an unfair

advantage in competitions.

But now the ban could be lifted

if there is no more doping.

On to footy now.

In the Premier League,

Tottenham and Crystal

Palace ended 1-0.

Harry Kane scored

in the 89th minute.

And at Old Trafford,

Man United are playing Chelsea.

United need to win if they want

to get back to second in the table.

And later it's the first big final

of the year,

as Arsenal take on

Manchester City at Wembley

in the League Cup.

Both teams will hoping

to get their hands on their

first trophy this year.

Next, Steve Backshall

is taking on one of the scariest

challenges of his life -

trying to climb a huge

mountain in Switzerland.

The north face of the Eiger

is 1,800 metres high

and very hard to climb.

So Steve's practicing on another

massive Swiss mountain and we've

just heard how he's got on.

So, we are over halfway

up the Stockhorn.

I am on the lead.

Leo is down behind me

in the gully somewhere.

It is absolutely stonking up here.

We have probably only

got, I don't know,

about an hour's climbing more to go

until we reach the summit.

And about time!

I could really do with a cup of tea.

We are on the summit

of the Stockhorn.

The wind is raging up here.

And that is our view.

We are up above the clouds.

And I am out of here!

Well done, Steve!

And if you want to know more,

then head to the CBBC website.

Next, Dr Tom has the answer to a big

question ? how are fireworks made?

Dr Tom is an expert,

so please don't try this at home.

Hello, I'm Dr Tom.

I'm a fireworks expert

and I'm here to answer this

week's big question.

Which is...

So fireworks are really

just lots of different

chemical reactions going on,

so to make colours we add metal

salts to the basic firework mix.

So, to get a red we strontium salts.

To get the green

we add barium salts.

To get yellow, we add sodium salts.

And to get a blue, which is the most

difficult firework colour

to get, you add copper

salts to the basic mix.

So what you would pack

into the fireworks to make

the effect in the sky

are what are called stars.

And there is a star.

This happens to be one that

will burn violet and then when it

gets towards the middle,

it changes and burns

with silver sparks.

It is about the size of a pea

and there will be hundreds of those

within the firework shell.

Black powder, or gunpowder

as some people call it,

is one of the key ingredients

when making fireworks.

It is there for two properties.

Sometimes to produce gold sparks

of long duration that flow down

to the ground and make a very pretty

visual effect, but more often

Sometimes to produce gold sparks

of long duration that flow down

to the ground and make a very pretty

visual effect, but more often

as a propellant to shoot the shell

into the sky or to be

the motor of a rocket.

The firework sounds,

like whistles and screeches,

are made from a different

type of chemistry.

And what we do as we press a little

tiny amount of this compound recipe

into the bottom of the tube and then

the rest of the tube acts

like an organ pipe to amplify

the sound and make a really loud

sound that we here

at firework display.

So this is a firework mortar.

It is what is used to fire

at the fireworks up into the air.

At a big show, we would have

hundreds and hundreds

of these together.

Here is the shell that goes in it.

The bottom part is with a black

powder is that's going to propel

the shell in the air and the top

half is the bit that is full

of the stars that produce that big

burst of colour in the sky.

It's that time of the week again

when things get a little strange

around here.

Yes, it's time for Strange,

Stranger, Strangest.

First, check out these happy feet.

Actor David Harper kept his promise

of dancing with penguins

in Antarctica on Valentine's Day.

The Stranger Things actor has

linked up with charity

Greenpeace to raise awareness

of the environmenal challenges

facing this part of the world.

Nice moves, David!

Next, check out this

amazing pyramid of dolls.

It was constructed in Japan to mark

the country's annual

Festival for Daughters.

There are around 1,800

dolls on the pyramid,

and people across Japan donated

the dolls for the show.

If you love fashion,

and you love animals,

this story is for you.

Models at a fashion show for big

designer brand Gucci have taken

to the catwalk carrying some

very unusual accessories.

These realistic-looking

animal figures.

They included a chameleon, a snake,

and even a baby dragon,

and were made by a top

visual effects company.

Try wearing one of those

at your next disco!

That's it from me.

Ricky is back bright and early

tomorrow morning at 7:40am.

Have a lovely Sunday.

Goodbye.