Answer:
They built new paved roads so that a greater number of dump trucks could remove the excavated earth. They sprayed insecticides to kill mosquitoes and built concrete locks to raise ships to a higher elevation.
Explanation:
Answer: Until this century, relative dating was the only technique for identifying the age of a truly ancient object. By examining the object's relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site. Hope this helps!
What's the question here? It's more of a statement.