23/02/2018 Newsround

Saturday as I go behind the scenes

of the incredible match between city

and Wigan. Quarter to eight in the

morning on C BBC. Goodbye.

Morning.

Ricky here with your

Friday morning Newsround.

First today, children

in the American state of Florida

who survived a shooting

at their school have met

with President Trump and lawmakers.

They went to the capital of Florida

and to Washington DC,

where they talked about the changes

they want to happen...

They went in their hundreds and

wanted to be heard. Children from

the school affected by the shooting

were joined alongside hundreds of

other students in Florida and

Washington, DC. Some of the

survivors of the shooting met with

President Trump because they want

changes to the gun laws so this will

not happen again. Trump suggested if

teachers in America were armed with

guns themselves they might be able

to stop a shooting from happening.

Some people support the President's

suggestion but others say more guns

is not the answer to the problem.

The US leader also said he would

like better checks on the

backgrounds are people who want to

buy guns. While the meeting took

place hundreds of children marched

outside. Many children across

America are planning to come

together in Washington, DC next

month for a protest they have called

March for our lives.

For more on this story,

go and take a look at our guide

at Newsround online.

We've also got advice

there if you're upset

by what you see in the news.

Football now, and Arsenal survived

a scare in their Europa

League tie last night.

Leading 3-0 from the first leg

against Ostersunds FK of Sweden,

they gave away two goals

in the first half.

But to the relief of the home crowd,

Kolasniac's goal secured a win,

getting the gunners

through to the next round.

The final score was

4-2 win on aggregate.

But Celtic's European

hopes are over.

Despite leading 1-0

from the first leg match

against Zenit St Petersburg,

Celtic let in three goals, crashing

out of the Europa League.

Dr Tom has the answer

to an explosive question ?

how are fireworks made?

Dr Tom is an expert,

so please do not try this at home.

Hello, I am Doctor Tom, a fireworks

expert. I am here to answer the big

question this week, which is from

Rees in Cambridgeshire and it is how

fireworks made? A firework is a lot

of different chemical reactions. To

make colours we add metal salt to

the firework mix. So we had a strong

team to get read. Very to get green.

Sodium salts to get yellow. And to

get blue, the most difficult colour

of the lot, you add copper salt to

the mix. What you packed into the

fireworks to make it effective are

called stars. This is a star. This

will burn the Violet and in the

middle it changes the composition

and burns with silver sparks. About

the size of a pea and hundreds of

them are in a firework shell. Black

powder or gunpowder as some call it

is one of the key ingredient in

making byword. It is two purposes.

Sometimes to produce gold sparks of

long duration flowing down to the

ground and making it look pretty but

more often as a propellant to shoot

a shell into the sky or to motor a

rocket. Fireworks sound like

whistles and screeches and they are

made from different types of

chemistry. We press a tiny band of

this composition into the bottom of

the tube and in the rest of the tube

it acts like an organ pipe to

amplify the sound and make a really

loud sound. This is a firework

mortar. It is what is used to fire

the fireworks into the air. We have

hundreds and hundreds of these added

together and the shell goes in here.

The bottom part is for the black

powder to propel the shell into the

air and the top part is full of the

stars reducing the big burst of

colour in the sky.

-- producing.

Head online for something

we want to hear YOUR views about.

After a school in Norfolk has banned

kids from having certain hairstyles,

we want to know if you think that

should be allowed.

Get online and join

in with the vote.

Over at the Winter Olympics

a 15-year-old figure

skater has won gold.

Alina Zagitova topped the scoreboard

with this performance,

narrowly beating her Russian team

mate to take the top prize.

It's the first gold won

by Olympic Athletes from Russia

at the games so far.

That's it for now.

Newsround's back in half an hour

with some amazing animals

and the coolest commute you'll

ever have seen.

Join us then.