Early 1800's. The Erie Canal was built in 1817
1 shale
2 schist
3 conglomerate
4 granite
A 90 degree clockwise rotation switches the numbers in the x and y places and makes x negative, for example, the coordinate (3,4) rotates 90 degrees clockwise and becomes (4,-3), or using a formula, A (x,y) -> A' (y,-x)
Answer:
1. capitalist economies 2. primary and secondary public schools
The study of the physical elements of the earth is the answer
