Using Photoshop Layers
Step One
Start by creating a new Photoshop file that is 1024 by 1024 pixels. Create a scene from nature that takes place using at least ten layers. Create a background and then place objects like mountains, trees into the document.
Step Two
Create another 1024 by 1024 file and use layers to create a scene of some part of Oakland. Use at least ten layers.
Step Three
Add your completed two files to your Keynote Slide show from the last Photoshop Project.
I have one video demonstration that show you exactly how to work with layers:
Understanding Photoshop Layers