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The upper layer is different from the bottom layer because the bottom layer has more gualities to a living thing than the upper layer.
convective layer
radiative layer.
Thermosphere and the exosphere
stratosphere
Layer > New > Background from Layer.
You must first place another image from Image > Place or drag from another document, then click on layer with image (layer with image which you want behind) on LAYERS palette and drag it below layer with image to be above.
Layer is basicaly image which can have transparent pixels. Every image have at list one layer. One image can consist from at list one layer and at most hundreds or thousands of layers, in Photoshop only limitation for number if layers is your computer memory.
I assume you mean after pasting an image into gimp. Right-click on the layer in the layer box, and click "new layer" that will put the image on it's own layer. Odd wording, I know.
You can not separate flattened layers (they have becomed one layer), only from history to go to step when you have flattened image.
No, it is not, regardless the image.
photosphere
Because is upside down. Reverse entire operation and attach trailer at correct location, which is not link layer.
Assuming you mean drag one layer from one image to another, you can simply grab the layer from your layer palette (generally on the right of your window) onto the new image canvas.
double click on it on layers pallete where are letters Background image and accept,this will convert background layer which is not editable by default to normal layer and then you can edit it
It is a cake or sponge pudding which is baked with a layer of pineapple cooked on the bottom under the sponge mixture. Then it is served upside down, with the fruit on top.
Content placeholder. You can put content like text or image on different layer then lock that layer to prevent accidental changes or to hide layer and its content.