Why was the Panama Canal built?

to shorten travel time from Panama to the Caribbean islands

to separate Panama from South America

to shorten the shipping route from the Atlantic to the Pacific Ocean

to establish a military base for Mexico

The expansion of grasses during the Oligocene and Miocene Epochs led to A. the extinction of mammals B. the expansion of tree-dwelling primates C. an increase in dinosaur and reptile species on land D.

Read the article titled "The Ancient City of Uruk" What did people discover when they began to excavate and explore Uruk?

You have discovered a fossil-bearing layer in East Africa and you wish to estimate its age. There are abundant fossils of many savanna species, and you have identified most of them to species or genus.

What chemical condition influence the precipitation of nonclastic sedimentary rocks?

The topography of Central America varies with what kind of land forms in the Highlands? A) flat plateaus B) tropical snow inlets C) volcanic mountains D) grasslands

Arid climates occur in both warm and cold settings and collectively form the largest climate region on the planet. The spatial distribution of these dry regions can be impacted by several factors.

Which of the following Rivers is unique because it is home to more species of large fish than any other River? A. The Huang He River B. The Yangtze River C. The Han River D. The Naktong River

The area just north of Lake Baikal is called?

When the Europeans traveled the Mississippi and the Amazon rivers, what did they bring to the native peoples of both continents? A. Gifts and wisdom B. Exotic plants and animals C. Smallpox and other disease D. Technology and knowledge

What are the major controlling factors for the variations of the water mass in the ocean?