Question

question 4
which form of technology did harry hess use to detect the ocean floor?
ocean map of seafloor
sonar
gps
satellite imagery
question 5
which of the following best describes what harry hess learned?
older rocks were located further from the ridge
no new land was formed
at divergent boundaries rocks were larger
magma sank in the area of divergence

Explanation:

For Question 4, Harry Hess used sonar to map the ocean - floor. Sonar sends sound waves and measures the time it takes for the echo to return to create an image of the ocean - floor. For Question 5, Harry Hess's work on seafloor spreading showed that older rocks are located further from the mid - ocean ridge as new crust is formed at the ridge.

Answer:

Question 4: B. sonar
Question 5: A. older rocks were located further from the ridge