This Scene presentation will provide a guide around North West Wales and, in particular, the National Park Eryri, or Snowdonia, to show how we can use GIS, in particular 3D web maps and imagery to visualise the relief of a glaciated landscape. A key question to have in mind is how closely do the glacial land forms of North West Wales correspond to the models that we see of glaciated features? We're going to use Scene's capacity to show a combination of satellite and mainly aerial imagery to take a tour of the glacial land forms in North West Wales. Our views have been saved in Slide Manager, and you can see a list of the slides just here. We're gonna look at them in presentation mode. So we're gonna zoom in on the landscape, first of all, to take an a bleak view, which means a view at an angle, and not from above, looking at the landscape. We zoom a little bit further and you might begin to see some glacial land forms that might be familiar. Then we move to get our first view of the highest mountain in the area, Snowden Yr Wyddfa, looking north. And we get a better view of this magnificent mountain with its pyramidal peak in the next Scene. It owes its pyramidal shape to having been eroded by glaciers on at least three sides. The erosion was done by corrie glaciers, and in between the corrie glaciers, we see aretes. And this is a famous arete called Crib Goch. If we take a closer look at one of these corries, Llyn Glas, we can see an excellent corrie lip, which is trapping a lake, a corrie lake, or tar in the armchair-shaped hollow, which has become deepened by the corrie glacier. Then we can move on to the Nant Francon valley, which is one of the most magnificent U-shaped valleys anywhere. And you can see running down the middle of the valley, we have a misfit stream, a stream that really wouldn't have had the power to carve out this valley. It would've had to be done by quite a large glacier, which would've easily filled this valley completely. If we could take a closer look at the valley sides, we can see several truncated spurs, so the glacier would've at least reached this height. We might try to imagine how those spurs were interlocking spurs in the drainage of the landscape before glaciation, but the Nant Francon glacier would've chopped the ends off them. That's what truncated means. And in a similar way, further up the valley, we see how the truncation truncated whole valleys and we are left with a hanging valley above the Nant Francon Valley now. A little further upstream, we have another U-shaped valley, and this one has a ribbon lake in it called Llyn Ogwen. And the Ogwen Valley provides a major transport route because you can see the A5, which is the main road from London to Holyhead, going through the valley. And that road has been there in one shape or another for about 2,000 years, since Roman times. On the same side as the road, there's a magnificent mountain called Tryfan. And at the base of that we see some fantastic scree slopes, which have been created by frost shattering. So freeze thaw action is taking place right up on those steep slopes and the rocks are falling down, creating piles of debris at the bottom of the slope. On the same side, a little further down is a hanging valley called Cwm Idwal containing a fantastic corrie called Llyn Idwal. It has a classic armchair shape created by the rotational movement of the corrie glacier, which would deepen the hollow where the lake is now, and then created the lip, which actually keeps the water from spilling out into the valley below. Beyond the lake, we see the corrie back wall with very steep crags created by plucking by the corrie glacier. Now hopefully you have a head for heights because we're gonna look at the back wall from above and we can get some idea of just how steep that back wall is, and this is where the plucking would've taken place, by the corrie glacier. So we've had a really good look at the North Wales landscape of glacier landforms. How closely do you think they align with the glacial landforms model?.