Question

multiple choice question
echo charts can be used to study the properties of the seafloor because

the charts include a chemical analysis of the seafloor at the point of reflection
the charts provide photographs of the materials
different rocks and sediments reflect signals differently

Explanation:

Echo - charts work on the principle of signal reflection. Different rocks and sediments on the seafloor have distinct physical properties that cause them to reflect sound or other signals differently. This allows scientists to infer properties of the seafloor. Echo - charts do not provide chemical analysis or photographs.

Answer:

C. different rocks and sediments reflect signals differently