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im_dead_sirius t1_j3yw9he wrote

Reply to comment by Bob_Skywalker in Why are coastlines crinkly near the poles but smooth in the tropics? by emsot

I think you are remembering that part of geology class somewhat incompletely. That's fine, geology is a huge subject.

All photos by me.

Ice gouges U shaped channels (especially on a huge scale), water erosion creates V shaped gouges. Here is a good example of the U shape of glaciation erosion, and the river in front of it, carving a V.

https://i.imgur.com/oddQgRL.png

At the base of a formerly glaciated mountain, you get steep smooth talus/scree piles of sharp rock, as sharp stones have a steeper angle of repose, and rain water runs down through glacial till, then out at the base. How much of a talus pile is there has a lot to do with how friable the rock is, after major glaciation retreated.

Example of glacial talus in an area with low rainfall.

https://i.imgur.com/C9FvYJV.jpg

All the rock in that talus fell after major glaciation carved the valley and lake.

Here you can see the material washed down by water erosion fans out at a lower angle, and is also more subject to erosion, as the scree is smaller and mixed with organics.

https://i.imgur.com/jylENUG.jpg

When it comes to coasts (and beaches), they are built and shaped by tidal action. Beaches, whether gravel or sand, are defined as being relatively low in slope, close to water, generally homogeneous in material size, even when (and if!) they are actually talus piles.

You can see this in Australia, where I'm hoping to go some day, to take my own photos. You won't notice these beaches on a map, nor in Northern regions that look all crinkly.

https://i1.wp.com/beautifulplacestovisit.com/wp-content/uploads/2011/09/Apostles_3_GOR.jpg

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Bob_Skywalker t1_j3zo0tx wrote

>I think you are remembering that part of geology class somewhat incompletely. That's fine, geology is a huge subject.

I was just making a quick response as noted in my original comment. Hours before you replied I even said it was explained in more depth by comments further down. I was at work, I didn't have time to go into detail.

As far as remembering that part of geology class incompletely, which class are you talking about? Stratification and Sedimentation, Hydrogeology, structural geology, Geophysics, Sedimentology...? Because as I said in my original comment, I have a degree in geology.

Was your entire objective to post your photos, toot your own horn, and act smugly smarter than someone with a degree in the topic at hand? Because it's not a good look.

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Muslim_Wookie t1_j409bs7 wrote

They don't even have the guts to reply to you, instead waxing lyrical about being a barman and telling time on analog clocks.

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Bob_Skywalker t1_j41kly2 wrote

Lol. Here I am worried I came off as too defensive, but now that I've slept on it, I feel it was reasonable. They strike me as the person that thinks they are an expert on every subject because they read an article after taking some photos. Probably cans his farts to smell them later.

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