CK12 Earth Science
Wind power uses the energy of moving air to turn turbines. Biomass energy uses renewable materials like wood or grains to produ ...
What causes the high temperatures deep inside the Earth that make geothermal energy possible? Do you think your town or city co ...
Chapter 6 Plate Tectonics 6.1 Inside Earth. Lesson Objectives Compare and describe each of Earth’s layers. Compare some of the ...
Exploring Earth’s Interior Earthiscomposedofseverallayers. Ontheoutsideistherelativelycold, brittlecrust. Below the crust is the ...
give scientists clues as to the core’s makeup and density. An iron meteorite is the closest thing to a sample of the core that s ...
Figure 6.3: A cross section of Earth showing the following layers: (1) crust (2) mantle (3a) outer core (3b) inner core (4) lith ...
crust, primarily rock dust and the shells of microscopic sea creatures, called plankton. Near shore, the seafloor is thick with ...
Figure 6.4: In a convection cell, warm material rises and cool material sinks. In mantle convection, the heat source is the core ...
planet’s rotation. If the surface layers are less dense than the average for the planet, then the interior must be denser than t ...
convection The transport of heat by movement. convection cell A circular pattern of warm material rising and cool material sinki ...
6.2 Continental Drift Lesson Objectives Be able to explain the continental drift hypothesis. Describe the evidence Wegener used ...
Figure 6.6: The continents fit together like pieces of a puzzle. This is how they looked 250 million years ago. ( 31 ) ...
These rocks were the same type and the same age. Wegener understood that the rocks had formed side-by-side and that the land has ...
Figure 6.7: Wegener used fossil evidence to support his continental drift hypothesis. The fossils of these organisms are found o ...
Magnetic Polarity Evidence The puzzling new evidence came from studying Earth’s magnetic field and how it has changed. If you ha ...
year old lava flows in North America indicated that the north magnetic pole was located in the western Pacific Ocean, but 250 mi ...
continents and the magnetic poles move (Figure6.10). Figure 6.10: The left side image shows the apparent north pole locations fo ...
is the only one likely to be true and why? In the face of so much evidence in support of continental drift, how could scientist ...
6.3 Seafloor Spreading Lesson Objectives List the main features of the seafloor: mid-ocean ridges, deep sea trenches, and abyss ...
Figure 6.11: A ship sends out sound waves to create a picture of the seafloor below it. The echo sounder pictured has many beams ...
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