The Geology Club traveled to the Grand Canyon for their spring break. Their teacher explained that the layers of red color were caused by iron in the rock. What most likely caused the iron-rich rock to erode?

a
animals
b
wind
c
falling rocks
d
running water

norsemen from northern countries had made earlier journeys

the crusaders are identified in the painting;

c. by the red crosses on their backs

discrimination! they faced a lot of racism

during the early years of world war i, the germans used "the submarine" to a great advantage