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2. Expanded clay aggregate - Wikipedia

   en.wikipedia.org/wiki/Expanded_clay_aggregate

   The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure. LECA has an approximately round or oblong shape due to circular movement in the kiln and is available in different sizes and densities. LECA is used to make lightweight concrete products and other uses.

3. Scoria - Wikipedia

   en.wikipedia.org/wiki/Scoria

   Its striking colours and water-holding properties can make it attractive for landscaping and drainage works. [8] Scoria can be used for high-temperature insulation, as in gas barbecue grills. [9] The ancient Romans used cinders as construction aggregates, one of the earliest industrial uses of volcanic rocks. [7]

4. 21 Creative Ways to Use Rocks in Your Landscaping - AOL

   www.aol.com/lifestyle/21-creative-ways-rocks...

   Landscaping ideas with rocks and mulch are low maintenance and great for curb appeal. These designer rock and mulch landscaping ideas will elevate your lawn. 21 Creative Ways to Use Rocks in Your ...

5. Trap rock - Wikipedia

   en.wikipedia.org/wiki/Trap_rock

   Vast areas of trap rock in the form of thick lava flows and other volcanic rocks comprise the Deccan Traps of India and Siberian Traps of Russia. [6] Other prominent basalt ridges, mountains, buttes, canyons, and other landscape features include: In North America: The ridges and cliffs of the Columbia River Gorge in Oregon and Washington.

6. Volcanic rock - Wikipedia

   en.wikipedia.org/wiki/Volcanic_rock

   The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...

7. Hawaii's Kilauea volcano shows more signs of elevated unrest

   www.aol.com/news/hawaiis-kilauea-volcano-shows...

   The lava flow from the eruption covered more than 880,000 square meters (217 acres). The eruption caused a "fissure" or crack near the crater that measured 1,600 feet.