Google Accessibility is Google's site that explains the accessibility resources that Google has for both users and developers and publishers.
There is a whole section on using the accessibility features for many Google products. Android Phones, Chrome Browser, Gmail, Docs, eBooks, Maps, Search, and more all have accessibility functions to help people with disabilities to use these products. There are keyboard shortcuts, video captions, high contrast video, text-to-speech and speech-to-text, and much more.
These features help all users, including people with blindness, visual impairment, color deficiency, deafness or hearing loss, and even limited dexterity use Google's products and access information on the web.
Teachers with students with impairments should explore these resources and help their students use them.