0:00:02 > 0:00:04All set at the beach, Dr Knowles?
0:00:04 > 0:00:05We sure are, Ms Hucklebuck.
0:00:05 > 0:00:07Everything is in place and we're ready to roll.
0:00:07 > 0:00:10Well, as long as there are no last-minute surprises.
0:00:10 > 0:00:16Lads, I want you to meet my new TV sidekick, Rocky the Seagull.
0:00:16 > 0:00:17Squawk!
0:00:17 > 0:00:20Oh, there's no way health and safety will allow this.
0:00:20 > 0:00:23And haven't you already got a sidekick? Hm.
0:00:23 > 0:00:24Rocky, this is Colin,
0:00:24 > 0:00:28he's your new boss and you have to do whatever he says, OK?
0:00:28 > 0:00:30- Squawk!- Ah!
0:00:30 > 0:00:33We're live from the beach in five, four...
0:00:33 > 0:00:36This is Brain Freeze,
0:00:36 > 0:00:38with Dr Knowles,
0:00:38 > 0:00:42Professor McCork,
0:00:42 > 0:00:44Colin, the floor manager,
0:00:44 > 0:00:47and Ms Hucklebuck.
0:00:47 > 0:00:48Stand by!
0:00:48 > 0:00:50Come on, everybody!
0:00:50 > 0:00:53Welcome to Brain Freeze, live from the seaside.
0:00:53 > 0:00:55It's time for...
0:00:58 > 0:01:01Today, we're asking why is the sea salty?
0:01:01 > 0:01:05Did you know that the Earth contains enough water
0:01:05 > 0:01:08to fill 493 trillion Olympic swimming pools?
0:01:08 > 0:01:11Less than 1% of this is fresh water,
0:01:11 > 0:01:142% is frozen in glaciers and icecaps,
0:01:14 > 0:01:19and the remaining 97% is salt water found in our oceans.
0:01:19 > 0:01:22Rocky wants to know where does all the salt come from?
0:01:22 > 0:01:25While some of the oceans' salt comes from volcanic vents
0:01:25 > 0:01:27or rocks on the seabed,
0:01:27 > 0:01:29most of it is actually from the land around us.
0:01:29 > 0:01:32Rainwater dissolves minerals and salts from rocks,
0:01:32 > 0:01:35collecting more and more as it makes its way down-river
0:01:35 > 0:01:38before eventually depositing them into the ocean.
0:01:38 > 0:01:41- Got to run, Dr Knowles, it's time for our big performance.- What?!
0:01:41 > 0:01:43Er, see you after the break.
0:01:43 > 0:01:46And we're clear.
0:01:46 > 0:01:50Ladies and gentlemen, prepare to be mesmerised
0:01:50 > 0:01:54by the one and only Rocky, the amazing juggling seagull.
0:01:54 > 0:01:55Oh, this looks like fun.
0:01:55 > 0:01:58- All set, Rocky?- Mm-hm.- Ready? Ready?
0:01:58 > 0:02:00Hup!
0:02:00 > 0:02:02OK, Rocky, we'll try that again.
0:02:02 > 0:02:06It's your first time on telly. All right, we'll go again. Ready?
0:02:06 > 0:02:08Hup! Ah! Ah!
0:02:08 > 0:02:12- Ow!- Hey, that's mine, get off! - McCork, get rid of this thing!
0:02:12 > 0:02:16SHE LAUGHS
0:02:16 > 0:02:18He's a natural, McCork!
0:02:18 > 0:02:21Sign that seagull up immediately!
0:02:21 > 0:02:23Shoo! Shoo!
0:02:23 > 0:02:26We're live in five, four, three...
0:02:30 > 0:02:34Oi, bird! Shoo!
0:02:34 > 0:02:35So, Dr Knowles,
0:02:35 > 0:02:38how does the salt get from the oceans onto our dinner tables?
0:02:38 > 0:02:40Most of the table salt we eat
0:02:40 > 0:02:42is mined from underground salt deposits on land,
0:02:42 > 0:02:44whereas the sea salt we eat
0:02:44 > 0:02:47is primarily produced through evaporation.
0:02:47 > 0:02:49The heat of the sun removes the water,
0:02:49 > 0:02:51leaving behind salt concentrates.
0:02:51 > 0:02:55Sorry, Doctor, Rocky has another question.
0:02:55 > 0:02:58He's wondering how much salt is in all the oceans?
0:02:58 > 0:03:00Good question. On average, our oceans consist
0:03:00 > 0:03:03of about 3.5% salt,
0:03:03 > 0:03:07that's around 50 million billion tonnes.
0:03:07 > 0:03:10By some estimates, if you spread it evenly
0:03:10 > 0:03:12over the Earth's land surface,
0:03:12 > 0:03:15it would form a layer more than 152 metres high.
0:03:15 > 0:03:16Zut alors!
0:03:16 > 0:03:20- That's it from us at the seaside. See you next time.- Squawk!
0:03:20 > 0:03:23And we're clear.
0:03:23 > 0:03:27McCork, do you think you could ask Rocky to come back to the studio
0:03:27 > 0:03:28for each screen test?
0:03:28 > 0:03:32- He's exactly the kind of entertainer this show needs.- What?!
0:03:32 > 0:03:36Did you hear that, Rocky? You're going to be a big TV star.
0:03:37 > 0:03:42He seems to be doing a lap of honour in celebration.
0:03:42 > 0:03:45Er, I'm not sure that's a lap of honour. Watch out!
0:03:45 > 0:03:48MS HUCKLEBUCK LAUGHS
0:03:50 > 0:03:56I love it, McCork! This is the best double act I've seen in years!