1.   A Plate Tectonic Re-cap Rather a lot has been said in this chapter about the minor details of lava flows.

2.   Although it is one of the most widely-known volcanic rocks, obsidian lava flows are rare.

3.   And I bet no man has ever appreciated the lava flow of sensuality so near your ice-perfect surface.

4.   In a few rare cases, lava flows on land have taken place just as the magnetic field was undergoing a reversal.

5.   Meanwhile, powerful United States Army helicopters continued dropping massive concrete blocks to hinder the lava flow.

6.   The discovery of lava flows that cover vast distances on the Moon provided an interesting clue to their composition.

7.   The feldspars in volcanic lava flows can also be problematic.

8.   The same is true of lava flows which are actually extruded under water.

9.   Their film shows the steep underwater flow front of a lava flow which was being erupted from a vent on Hawaii itself.

10.   These depths consist of vast mountain ranges, deep canyons, mighty steaming lava flows.