Question

which information did the glomar challenger study in 1968?
the rate of seafloor spreading
the direction of seafloor spreading
the age of rocks in various places in the ocean
the contents of rocks in various places in the ocean

Explanation:

The Glomar Challenger was a scientific drilling vessel. In 1968, it was part of the Deep Sea Drilling Project. One of its main goals was to study the age of rocks in different ocean locations. By drilling cores from the ocean floor, scientists could determine the age of the rocks, which provided crucial evidence for the theory of plate tectonics and seafloor spreading. The rate and direction of seafloor spreading were concepts that could be inferred from the age data (for example, the rate could be calculated if the distance from the mid - ocean ridge and the age of the rock were known, and the direction could be seen from the pattern of magnetic reversals in the rocks related to their age). However, the primary data collected directly by the Glomar Challenger in 1968 in terms of drilling and sampling was related to the age of the rocks. The contents of the rocks (while sometimes studied) were not the main focus of the initial 1968 studies compared to the age.

Answer:

the age of rocks in various places in the ocean