The issue is not your ISO (or your aperture or the shutter speed). The issue is dynamic range. The brightness of the sky is A LOT brighter than the brightness of everything else in the scene. So if you set your exposure for the foreground, then the sky is beyond what the camera can capture and it becomes blown out. If you had exposed for the sky, the foreground would be too dark.
As the photographer, you have to realize this and make a choice...do you want to expose for the dark areas or the bright areas....or somewhere in between? This is nothing new, photographers have been making these choices since the invention of photography.
So how to you get around this problem? The easy solution is to change it up...move around, pick a different angle or composition, shoot at a different time of day or different weather conditions. If you have get your scene so that the dynamic range isn't so huge...then you will be able to get all the tones into one photo. Another option would be to add light. If you had reflected some light, or used a flash to put some light onto the dark foreground, then it would be closer to he brighter sky and you might have been able to expose for both at the same time.
Lastly, you could take multiple photo, changing the exposure as you go (bracketing). Then you can use software to combine them into a single image that has more tones than the camera could capture in a single exposure.
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