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

2.   The volcanic lava solidifies as it cools.

3.   ...when Mother Nature created Iceland out of volcanic lava and glaciers.

4.   The city was entombed in volcanic lava.

5.   At the Halona Blowhole, every few minutes the waves force great spouts of water to erupt through an old volcanic lava tube.

6.   A volcanic lava of hot anger began boiling inside Congress.

7.   But in Iceland the beaches are made of volcanic lava, and they fringe steamy azure pools of geothermally heated water bubbling over with swimsuited blondes year-round.

8.   Its pitted, knobby surface resembles the vesicles in cooled volcanic lava, tiny holes left by gas bubbles.

9.   Plus, the sights, such as beaches made of volcanic lava, are awesome to behold.

10.   Goma is surrounded by volcanic lava so latrines can only be dug by heavy drilling equipment.