Oaks are lobed leaved plants. This means they have prominate depressions in the sides of the individual leaves. Spanish and Red oaks normally have more of a jagged edd to them with less of a indentation. Their leaves are normally 5 to 9 inches long. Scarlet, Pin, Post, English, and White oaks have very noticable lobes ranging from 4-7 lobes depending on species. To get pictures of these oaks, just type in oak on google.
Magnolia's have huge, thick, and waxy leaves. Normally 6 to 12 inches long. They are noramally broad all the way to the tip which suddenly comes to a sharp point. Magnolias are more south eastern plants. They constantly shed their leaves.