Some uses may be considered "fair" within the law, in the case of face-to-face teaching activities. It's not necessarily the case that all uses by students would be fair.
They can be, but few rightsholders would take action. In preparation for the "real world," however, students should be encouraged to use Creative Commons or public domain images whenever possible.
No; registration is not required for protection.
Materials are not required to have a notification on them in order to be protected.
It is an image that has been put as copyright. This means others may not use this image without permission, or legal action can be taken.
No. Unless a "fair use" exception applies use of someone elses copyrighted property without permisson is the definition of copyright infringement.
No. It is illegal to use someone's images from Photobucket or from anywhere (either digital or not) without written permission from whoever owns the copyright to that image. It is usually, but not always, the photographer who took the image that retains the copyright.
Stock photos are images that are available for free. If you see these kinds of photos, then they are safe to use without copyright infringement.
NO THEY ARE NOT!! The results of a BING image search returns images from the Internet, but that DOES NOT MEAN that they are yours for the taking! These images are not free for anyone to swipe. They are the copyright of their respective owners, and if you use use them without permission, you can be subject to lawsuit for copyright infringement.
The images in Monopoly are copyright, which means you will need legal permission from the games copyright holders to publish the image.
You may only use images that are your own original work, in the public domain, or for which you have a license from the copyright holder.
Public domain images have no copyright restrictions.Creative Commons images are protected by copyright, but have extremely broad licenses.
It depends on the conditions placed on the use of the images by the copyright owner. The majority of images on the net are Copyright and you need to check the sites on which they appear to see if permission is granted to use them. If permission is given then usually there's conditions. You need to assume that the images CANNOT be used, unless you can find something (often under the sites Terms and Conditions) that specifically says you can.