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Click back on the RGB channel to be able to see the image in colors again. Click on the GROUND on your palette Layers and go to Select > Load Selection... and in the box Channel choose the option Blue copy. Press OK.
This step activates the selection based on the "Blue copy" channel. Everything which was white will be selected, black stays unselected. Now simply press Delete on your keyboard to delete the sky from the picture with ground. After this step you should have picture similar to the one below.
Step 3 - Adjusting the Mountain
If you take a look on the picture above you can probably see that the mountains on the horizon should be less blue and more orange because of the sun nearby. You´ll fix it in this step.
Add new adjustment layer Selective Color on the top of your layers (To do that click on the button "Create a new fill or adjustment layer" which can be found on the bottom part of the palette Layers. If you don´t see this palette go to Window > Palette or simply press F7 on your keyboard.)
I write it in all tutorials but I feel I need to mention it here too - try to use adjustment layers instead of direct adjustments as often as possible. This way you can change it during the whole process of doing manipulation not as long as History remembers your steps. In other words - thanks to adjustment layers adjustment is always reversible and changeable.
Set the adjustment layer Selective Color in the same way as you can see on the following picture.
Right click on this adjustment layer and select the option Create Clipping Mask. This way the adjustment affects only one layer bellow which means the GROUND. Click on the thumbnail of this layer (see picture below), grab the Gradient Tool (G), pick black color and fill the thumbnail with it.
Grab the Brush Tool (B), pick white color and paint over the mountain. This way the adjustment affects only the mountains and not the whole GROUND. Your image should look like the one below so far.
As you can see on previous picture the adjustment makes mountain bit more orange/rose but not over all parts and because of that they look badly stained. To fix that create a new layer on the top of your layers. Create clipping mask from it and name it e. g. MORE ORANGE.