What are hieroglyphs ?

Hieroglyphs is what the ancient Egyptians and maybe some other civilization used. It is basically their writing system and their language. Hieroglyphics are based on a visualization/picture to represent and depict words. These pictures show situations or describe something.

Attached is an image/example of one. Courtesy of Google Images:

a system of writing in which pictorial symbols represent meanings or sounds; writing or symbols that are difficult to decipher

Explanation:

answer at the divergent plate boundary in the middle of the ocean;