0:00:10 > 0:00:12Good afternoon, it's Whitney here with your Sunday Newsround.
0:00:12 > 0:00:18First up, we're talking snow!
0:00:18 > 0:00:20More is predicted today across Wales, the Midlands,
0:00:20 > 0:00:22northern and eastern England, with up to ten centimetres
0:00:22 > 0:00:26expected on higher ground.
0:00:26 > 0:00:29Weather warnings are also in place for scotland and Northern Ireland.
0:00:29 > 0:00:32And I asked you to send us your snow snaps while I'm stuck in the studio
0:00:32 > 0:00:36and you guys never dissapoint!
0:00:36 > 0:00:39First up, Alice and Holly are aged nine and six from Newport Pagnell.
0:00:39 > 0:00:42Here they are with their snowman, Gorilla.
0:00:42 > 0:00:43Looking great.
0:00:43 > 0:00:44Look at those teeth!
0:00:44 > 0:00:46Jaden is from London and shares with us his
0:00:46 > 0:00:48wintry white back garden.
0:00:48 > 0:00:51Daniel aged seven from Rugby says "Here's the snowman I made
0:00:51 > 0:00:53with my sister Hannah."
0:00:53 > 0:00:56Loving the outfit on the snowman guys - I'm
0:00:56 > 0:00:58taking some fashionista tips from that.
0:00:58 > 0:01:00Kiran, eight from London, says, "Watch out...
0:01:00 > 0:01:03a snowball from Snaresbrook."
0:01:03 > 0:01:06And finally seven-year-old twins Amy and Fred from London proudly show
0:01:06 > 0:01:09the snowman they built this morning.
0:01:09 > 0:01:12Thank you so much for all your pictures and I hope
0:01:12 > 0:01:17you all continue to enjoy the snow.
0:01:17 > 0:01:24Football news now and it's a double derby day today
0:01:24 > 0:01:27in the Premier League as Liverpool face Everton with their kick
0:01:27 > 0:01:29off in about 20 minutes, followed by league leaders
0:01:29 > 0:01:31Manchester City taking on second place Man United
0:01:31 > 0:01:32in the late kick-off.
0:01:32 > 0:01:34City probably go in to the Manchester match as favourites,
0:01:34 > 0:01:36as they're currently eight points ahead of their Manchester
0:01:36 > 0:01:37rivals in the league.
0:01:37 > 0:01:42However, United are on a pretty good run, so what do the fans think
0:01:42 > 0:01:44the results of the derbys will be?
0:01:44 > 0:01:51We've been finding out.
0:01:51 > 0:01:53I think it is going to be 3-1 Manchester City
0:01:53 > 0:01:56in the derby and I think Aguero is going to score.
0:01:56 > 0:01:59I think the score is going to be 2-1 to Everton and Wayne Rooney
0:01:59 > 0:02:01is going to score both of them.
0:02:01 > 0:02:03I think it might be 4-2 to Liverpool because they've been doing
0:02:03 > 0:02:05really good this season.
0:02:05 > 0:02:08I think it is going to be 2-1 to Manchester United
0:02:08 > 0:02:10because they are the best team in the world.
0:02:10 > 0:02:12I reckon it is going to be 3-0 for Everton.
0:02:12 > 0:02:15I reckon Rooney is going to score two and Calvert-Lewin
0:02:15 > 0:02:16will score one.
0:02:16 > 0:02:19I think the score is going to be 2-1 to Man City.
0:02:19 > 0:02:21I think it might be 1-1.
0:02:21 > 0:02:28I think the derby is going to be 1-0 to United and the goal-scorer
0:02:28 > 0:02:29is going to be Rashford.
0:02:29 > 0:02:32The score on Sunday is going to be 3-1 to Liverpool.
0:02:32 > 0:02:34I was really happy when Wayne Rooney signed for Everton again
0:02:34 > 0:02:37because he's a great team player and it makes a great
0:02:37 > 0:02:38change to the team.
0:02:38 > 0:02:41I think it is going to be 2-0 but Rooney is going
0:02:41 > 0:02:42to bang them both in.
0:02:42 > 0:02:45Kevin de Bruyne is City's best player because he makes
0:02:45 > 0:02:48loads of good passes.
0:02:48 > 0:02:50I really like Jurgen Klopp as Liverpool manager
0:02:50 > 0:02:52because I like his celebrations and I like the way
0:02:52 > 0:02:58he cheers for them.
0:02:58 > 0:03:01I think the score is going to be 2-1 to Liverpool.
0:03:01 > 0:03:07City are pretty good on the top of the league.
0:03:07 > 0:03:09I think City are going to win 10-0.
0:03:09 > 0:03:12Jose Mourinho is a really good manager and he picks
0:03:12 > 0:03:16really good teams.
0:03:16 > 0:03:19The derby in Liverpool is going to be very good
0:03:19 > 0:03:20because both are winning
0:03:20 > 0:03:26teams and everybody loves to see them play.
0:03:26 > 0:03:29Next, we've been asking you to send us your Big Questions.
0:03:29 > 0:03:31Well this week's has been sent in by Joshua who
0:03:31 > 0:03:33is 12 and he asked...
0:03:33 > 0:03:35How do we date things in the past?
0:03:35 > 0:03:39Well Joshua, here's your answer!
0:03:48 > 0:03:51Hello, my name is Bill Sellers and I'm a palaeontologist
0:03:51 > 0:03:55at the University of Manchester.
0:03:55 > 0:03:57When you see things in museums, there's often a date associated
0:03:57 > 0:04:00and it's actually really difficult to work out how old something
0:04:00 > 0:04:03is that's very old like that, and we rely on radioactive decay.
0:04:03 > 0:04:09So there are certain elements that
0:04:09 > 0:04:12change over time into other elements and they do that at a fixed rate,
0:04:12 > 0:04:16so it's like a clock slowly ticking down.
0:04:16 > 0:04:19Things like carbon, carbon-14, which means carbon dating,
0:04:19 > 0:04:24is great for periods up to about 50,000 years.
0:04:24 > 0:04:26If you do it right, you can be accurate
0:04:26 > 0:04:29to within even tens of years.
0:04:29 > 0:04:32It's a really good technique but for older things like dinosaurs,
0:04:32 > 0:04:37carbon dating is no good and we have to use other elements.
0:04:37 > 0:04:40And then things like the decay of uranium to lead is a really good
0:04:40 > 0:04:42clock, and we can use that for periods of hundreds
0:04:42 > 0:04:43of millions of years
0:04:43 > 0:04:46and it's accurate to within about a million years, say.
0:04:46 > 0:04:51So, to date things from the past we have to use radioactive decay
0:04:51 > 0:04:57to help us figure out how old something years.
0:04:57 > 0:04:59to help us figure out how old something is.
0:04:59 > 0:05:01Radioactive decay is when one element turns into
0:05:01 > 0:05:02a different element over time.
0:05:02 > 0:05:04Elements are teeny tiny building blocks that make up
0:05:04 > 0:05:07everything in the world, like air, water or humans.
0:05:07 > 0:05:09Radioactive decay can take a long time,
0:05:09 > 0:05:15thousands of years!
0:05:15 > 0:05:18Scientists know how long it takes for each element to change.
0:05:18 > 0:05:21This happens at a fixed rate, a bit like a clock ticking down.
0:05:21 > 0:05:24So, by looking at fossils and seeing how many elements have changed,
0:05:24 > 0:05:32scientists can work out how old.
0:05:32 > 0:05:34Finally, imagine living in a town where there are more flying
0:05:34 > 0:05:35bats around than people.
0:05:35 > 0:05:38Well, that's actually happening in a town in Australia.
0:05:38 > 0:05:40Charters Towers in Queensland are currently dealing with what looks
0:05:40 > 0:05:42like a bat invasion.
0:05:42 > 0:05:44Residents have complained about the noise levels
0:05:44 > 0:05:46and are trying to deal with the issue by removing trees
0:05:46 > 0:05:50and setting up nets.
0:05:50 > 0:05:51That's all from me today.
0:05:51 > 0:05:52We'll be back tomorrow morning.
0:05:52 > 0:05:55Bye!