Robert Smithson pioneered one of the most important ecological landmarks of the late twentieth century, the piece known as ,a 1,500 foot-long coil consisting of 6,650 tons of local black basalt, limestone, and earth.

A)Remains
B)Spiral Graph
C)Twist
D)Spiral Jetty

Why were presidents andrew jackson and martin van buren unwilling to annex texas? a. they did not want texas to be admitted to the union as a slave state. b. they feared that the annexation of texas as a slave state would lead to political problems within the union. c. they thought that texas was too large to be admitted to the union as one state. d. they did not believe in the idea of manifest destiny.