Through a self-guide grid, you can see how theories of dinosaur have evolved, from the first discovery of the unidentified bones to modern theories of distinction through a mass migration sparked by changing sea levels. You can explore over 100 years of changing scientific theory on environmental issues which effect paleontology and examine changing views of dinosaur anatomy, from the days of dinosaurs to classic theory of dinosaurs as close kin to birds. A free online site that lets Spanish language learners study a variety of terms. Easy to navigate, with lots of useful information. Volcanoes are openings in the earth's crust that release molten rock.
Volcanic eruptions range from quiet flows of lava to violent explosions of ash, rocks, and gas.
There are active volcanoes all over the world, but PlanetDiary will feature the most explosive stories. If you have a sound card and a microphone for your computer, you can make free long-distance calls to anyone in the United States through the Internet. It s called Voice Over IP where IP stands for Internet protocol. The person you call does not need a computer your call goes directly to their regular telephone. You can also make local calls through your computer.