John wesley powell, who led the first boat trip through the grand canyon, called the feature marked by the yellow lines above "the great ". what did he put in the blank?

a. unconformity.
b. pull-apart fault.
c. thrust fault.
d. trompe l'oeil.
e. intrusion.

The two types of plains are coastal plains and lowland plains

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor. b. increased mechanization has increased the need for water, thereby increasing the need for labor. increased mechanization has increased the use of land, thereby increasing the need for labor. d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

What is a problem natives in both bolivia and peru face? a. extreme poverty c. discrimination b. limited access to resources d. all of the above