The boundaries of eras are marked by great worldwide changes in?

A) earth's crust

B) life forms

C) climate

D) continental coastline

This is a way to estimate the order of geologic events by using rock layers

Why did harriet tubman decide to excape alone

In the Wichita tribe, relationships were traced through women in the family because the society was (A) Patriarchal (B) Matrilineal

What is the largest and most important river system in south america? a. the amazonb. the orinococ. the rio granded. the rio de la plata

What are the three types of maps?

explain two reasons as to whether or not you believe sustainability is an unattainable object next determine two barriers currently in place to make achieving sustainability difficult propose one alternative that can be used in place of

Most rivers have relatively gentle gradients in the headwaters and steep gradients in their downstream portions. True / False.

In which world region do hurricanes form? A. along the Equator B. near the poles C. only in the Atlantic Ocean D. only in the Pacific Ocean

What is the diameter of the geosphere

A major concern about increasing global temperatures is that a large portion of polar ice could detach and melt into the ocean.