Oh yes, that is so true :)
The answer is steamboats! The first steamboat came year 1807 and was invented by John Fitch:)
Answer B. Continental shelf:
Explanation:
Just looked it on Nasa website says it forms on oceanic and continental plates
Using the principles of cross-cutting relationships, you can determine the relative age of rocks found in the ground. The idea behind it is that the geologic feature which cuts another is the younger of the two features, and it had been around for 400 years. It's not very precise but it is good for determining relative age.
The correct answer C. Pectinoid is the most occurring fossil that is a bivalve. They are a superfamily of marine bivalve mollusks which includes scallops and oysters. Members of this family have a triangular resilium.