Geography

Facebook Twitter

World Political MapMaker Kit. About This MapMaker Kit The World Political MapMaker Kit maps include country boundaries, city names, and other political features.

World Political MapMaker Kit

For a world map without country boundaries see the World Physical MapMaker Kit. Download, print, and assemble maps of the political world in a variety of sizes. World Physical MapMaker Kit. About This MapMaker Kit The World Physical MapMaker Kit maps includes a map without country boundaries, city names, and other political features.

World Physical MapMaker Kit

For a world map with country boundaries see the World Political MapMaker Kit. Download, print, and assemble maps of the physical world in a variety of sizes. Watch the tutorial video above to get started. Then download each piece of the MapMaker Kit as a PDF file. Volcano. A 2007 eruptive column at Mount Etna producing volcanic ash, pumice and lava bombs Santa Ana Volcano, El Salvador, a close up aerial view of the nested summit calderas and craters, along with the crater lake as seen from a United States Air Force C-130 Hercules flying above El Salvador.

Volcano

Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption. Convergent boundary. Descriptions[edit] The nature of a convergent boundary depends on the type of plates that are colliding.

Convergent boundary

Where a dense oceanic plate collides with a less-dense continental plate, the oceanic plate is typically thrust underneath because of the greater buoyancy of the continental lithosphere, forming a subduction zone. At the surface, the topographic expression is commonly an oceanic trench on the ocean side and a mountain range on the continental side. An example of a continental-oceanic subduction zone is the area along the western coast of South America where the oceanic Nazca Plate is being subducted beneath the continental South American Plate. Tectonic Plates. The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building.

Tectonic Plates

Plate tectonics is a relatively new theory and it wasn't until the 1960's that Geologists, with the help of ocean surveys, began to understand what goes on beneath our feet. Where is the Evidence for Plate Tectonics? Earth Floor: Plate Tectonics. Convergent Boundaries Places where plates crash or crunch together are called convergent boundaries.

Earth Floor: Plate Tectonics

Plates only move a few centimeters each year, so collisions are very slow and last millions of years. Even though plate collisions take a long time, lots of interesting things happen. For example, in the drawing above, an oceanic plate has crashed into a continental plate. Looking at this drawing of two plates colliding is like looking at a single frame in a slow-motion movie of two cars crashing into each other. Just as the front ends of cars fold and bend in a collision, so do the "front ends" of colliding plates.