U.S. History Interactive Maps In this interactive, maps provide an overview of key themes in U.S. history, and are built on a series of bookmarks with markers highlighting events and people that illustrate the theme, along with map layers that provide additional information. Educators and students can customize maps by adding bookmarks, markers, and information and save them as their own.
Today, there are many active volcanoes
worldwide. Is there anything we can do to predict how and when
they will erupt?
As the world's population grows, more and more people are
living in potentially dangerous volcanic areas. Volcanic eruptions
continue--as they have throughout most of geologic time--posing ever-greater
threats to life and property.
Mt. Rainier looms over the Seattle/Tacoma area, endangering
a population of more than three million people. South of Mexico
City, Popocatépetl has begun to come to life again, putting
a million nearby residents at risk. Another million people
living in the Naples area are threatened by Mt. Vesuvius'
continued unrest. The need for planning is urgent.