The appearance of banded iron layers in the rock record between 1.08 and 3.8 billion years ago reflect the alteration of oxygen-rich and oxygen-poor conditions in the ocean at that time.

True or False

What did the Spanish have that the Aztecs didn't?

Why did the following change occur? The snow that covered the ground all winter began to melt, temperature rose, and flowers started to bloom. a) days became shorter b) earth's tilt on its axis shifted.

Which factor does not affect the amount of water that can be stored in the ground? a. fractures in rocks b. pore spaces in rocks c. the existence of caverns d. elevation above sea level

Can you think of any commercials or television shows today that contain Social Darwinist ideas?

What is most likely to happen to an abandoned strip mine over time?

How can you fix coal mining rhat causes pollution?

What is the western most capital of the west

Is it possible for a mineral to have a prismatic habit without having any cleavage? why or why not? if yes, give an example

Which structure or landform could be a batholith? A. A limestone cavern, such as the popular Mammoth Cave in Kentucky C. A group of mountains, such as the coastal mountains of British Columbia

Vanessa has 3 yards of cotton. She needs 3/4 yard for each skirt she makes. How many skirts can she make?