Mrs. Ballew's Amazing CC Class
At home: Week 17 (and Week 16!)
Mizz Whizzle Science Expansion
Divergent Boundaries - Geologic tension is also found in the tectonic regions of divergent boundaries. Here, a magma chamber forms underneath oceanic crust and causes sea-floor spreading in the creation of new oceanic crust. Some of the force that pushes the two plates apart is due to ridge push force of the magma chamber. Tension, however, accounts for most of the "opposite directions" pull on the plates. As the separating oceanic crust cools over time, it becomes more dense and sinks farther and farther away from the ridge axis. The cooling and sinking ocean crust causes a tensile stress that also helps drive the pulling apart of the plates at the ridge axis. Rocks also split from build up of too much pressure tension from below. Magma forms from partial melting of mantle rocks. As the rocks move upward (or have water added to them), they start to melt a little bit. These little blebs of melt migrate upward and coalesce into larger volumes that continue to move upward. They may collect in a magma chamber or they may just come straight up. As they rise, gas molecules in the magma come out of solution and form bubbles and as the bubbles rise, they expand. Eventually, the pressure from these bubbles is stronger than the surrounding solid rock and this surrounding rock fractures, allowing the magma to get to the surface.
Building Bridges - Rainbow Bridge isn’t a rainbow, but it is pretty neat. Water flowing from the mountains to the Colorado River eroded sandstone over many years. The water caused a bridge or arch of sandstone to form. This natural bridge is almost 300 feet high and 270 feet wide. Rainbow Bridge is a great example of God's greatness. It is able to stay standing because it balances itself the same way your books did in your experiment. It overlaps in such a way that it places the center of gravity of the structure over the supporting sides of the rocky places. What took us a lot of thinking, nature is able to do all on its own. We need to remember that some of the most beautiful things come from years of wearing away. Just look at the beautiful Grand Canyon and the rainbow bridge. They have been wearing away for years and it is so beautiful. Sometimes things in our life may feel like they are wearing us away or tearing us down. However, there is always a plan and sometimes some of the most beautiful moments come from the trials in our life.
Dürer & Michaelangelo
Presentation Ideas for Week 18
Skill- Developing a visual aid – use an appropriate map and/or pictures of your topic area; Show us on the globe