http://userfiles.educatorpages.com/userfiles/MsMincey/waves study guide with answers.docx This is the study guide key.
http://www.ck12.org/book/CK-12-Physical-Science-For-Middle-School/section/19.1/ Extra reading for Waves
http://www.ck12.org/book/CK-12-Physical-Science-For-Middle-School/section/20.0/ Extra reading for Sound
http://www.ck12.org/book/CK-12-Physical-Science-For-Middle-School/section/22.0/ Extra reading for Visible Light
http://glencoe.mheducation.com/sites/0078617766/student_view0/chapter3/section1/self-check_quiz-eng_.html Practice Quiz 1
http://highered.mheducation.com/sites/0078617766/student_view0/chapter1/section2/self-check_quiz-eng_.html#quest2 Practice Quiz 2
http://glencoe.mheducation.com/sites/0078685540/student_view0/unit3/chapter10/interactive_tutor.html Waves Game