volcanic rock


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Words related to volcanic rock

extrusive igneous rock solidified near or on the surface of the Earth

References in periodicals archive ?
In fact, Rodda says, it often seeps down through the porous volcanic rock that makes up the top of the tube and flows away underground.
The volcanic rock floats on water because it has the largest surface-area-to-volume ratio of any type of rock, which would have allowed it to act as a raft collecting material before becoming beached on a shore.
3) A bed of volcanic rock creates a visually appealing Bromeliad bed.
Volcanic Rock won a point-to-point in November last year on the back of a layoff, so the three-month break isn't an issue, and the rider that day was the useful Brian O'Connell, who is back on board for the first time since.
The rock in the Conmee area is the same kind of volcanic rock found in Timmins, Kirkland Lake and Quebec where 60 million ounces of gold have been found, Wilkinson says.
The volcanic rocks are composed of clastic flows, from fine-grained silts to coarser conglomerates, and in numerous places are brecciated and broken.
From the color ,and texture of the surface, scientists had guessed that Ebenezer, which lies in an area known as Columbia Hills, might be a volcanic rock that had remained unaltered for eons.
7 billion-year-old volcanic rock and practically pop out of the soil instead of having to drill hundreds of feet down.
SIMI VALLEY - For more than 40 years, John McCarthy has dabbled at making arrowheads from obsidian, the glasslike volcanic rock most prized by American Indians for their weapons and cutting tools because of its lethal sharpness.
The skull's estimated age derives from its position below a previously dated layer of volcanic rock and above a soil laver containing evidence of a reversal in Earth's magnetic field known to take place more than 700,000 years ago.
Many DOE scientists think Yucca is the safest place to store nuclear waste: The terrain is forged of dry volcanic rock rugged enough to entomb nuclear waste for 10,000 years.
SIMI VALLEY - For more than 40 years, John McCarthy has dabbled at making arrowheads from obsidian, the glass-like volcanic rock most prized by American Indians for their weapons and cutting tools because of its lethal sharpness.
During construction, the speedy Tunnel Boring Machine proved too overpowering for the unstable volcanic rock beneath the Tsugaru Strait.
The resulting spectra provided more evidence that Barnacle Bill is a volcanic rock.
20 samples of highly silicified stockwork and argillically altered with limonite volcanic rock showing silica and disseminated sulphides were taken.