When re-using images in your educational materials, you'll want to play if safe by only using images that have been licensed for this re-use. Often, even though you're "allowed" to re-use them, there is a requirement to provide attribution as part of your learning object.
Open your browser and visit Google.com
Select on Images Tab.
Use the built in filters to limit your search.
- Select on Search Tools to reveal advanced filter options.
- Select on Usage Rights to limit search results to your preferred parameter.
- Select your preferred parameter.