good morning everyone today we're out at your simony Valley National Park and I've turned the camera around so you can't see me so you can see this amazing landscape so you assume it E is part of the Sierra Nevada mountains which this is pretty interesting to me these are not tectonic mountains per se as a continental continental or connell ocean collision this is what you're looking at a batholith so this whole area which is much bigger than what you're seeing in this picture was once hot magma right beneath Earth's surface so back during the Jurassic we had a plate that was subducting off the pacific coast and in place it put an immense amount of magma this is not the only basileus that was put in place there was quite a few the idaho pathless and the coast range which goes all of the canadian western seaboard but this was all once magma so most of the rock that you can see throughout this whole area is granite there's a history of quite a lot of magmatic intrusion so in some area we have Granite's and they're natives we have granted i right but in any event this is mostly all granite and what you see is a point right here strategy that is Half Dome and Half Dome was never a full dome was once always always have but this is just magma so when magma forms you're not going to get a nice bubble remember magma is a liquid so it's going to go up through any crack and fissure it can so here we can see where the magma filling up is your crack right and form this area now you might say why there's right well if it's going to formal into all these cracks and fissures why do we see all these rounded edges right inside well that's due to gravity so what these don't do is called which i think is kind of a hilarious term it's called exfoliation so gravity is constantly pulling down on the top of it and in a later video I'll get to a point to show you some exfoliation joint but it's going to it's going to crack and what's going to happen as a crack systems slide downward so that's going to give it this nice smooth shape another thing that's given this area a nice smooth shape is glaciation there has been an immense amount of glaciation much later in time through this area so as this bath was formed it cooled about two miles below the ground later in time as we continue to get mountain growth in the Cordillera this area was uplifted all of two miles worth of sediment was eroded off the whole bath was kind of tipped up a little bit in exposing it and as of course of glaciers work through the area you can see it is really carved a lot of this out another spectacular feature which I'll see if I can zoom in here a little bit are the waterfalls the waterfalls are just amazing here and of course the water is coming from the snowmelt as you can see up here today it's pretty smoky from the wildfires that are burning out so you can't really see the snow-capped top but if you could see we see these mountains way off in the distance a lot of those to have snow tops and as that snow melts you're going to get these huge waterfall this is the the upper fall here's the Nevada fall the lower fall is the vernal fall but there's another waterfall which i think is impressive in this Park which is the Yosemite waterfall and in the Yosemite fall there's enough water that comes over there and if you equate it basically every second it's like two cars driving off of the waterfall and pounding into the rocks every two seconds but what's impressive if you take a look back here you notice that it hasn't really eroded that v-cut into these rocks very well even though this was just waters been pouring over the edge for thousands of years I just definitely goes to show you the durability of granite so hopefully this is a nice sweeping view of Yosemite and about the cool bath left for you I said I'll try to get to a later video see if I can find a spot for some great exfoliation domes so until next time