on April 1, 2022
What is relative age mean?
Regional SpecificsRelative age is the age of a rock layer (or the fossils it contains) compared to other layers. It can be determined by looking at the position of rock layers. Absolute age is the numeric age of a layer of rocks or fossils. Absolute age can be determined by using radiometric dating. Which is an
on April 1, 2022
What is green granite?
Regional SpecificsWhat Is Green Granite? When a granite rock consists of Amazonite – KAlSi3O8, which is a green variety of feldspar, it becomes green granite. The variations in shades, grains, veins, background, and patterns found in green granite types of rocks. What is the name of green granite? The incredible Green Eyes Granite is a subclass
on April 1, 2022
What do hydrothermal solutions contain?
Regional SpecificsHydrothermal solutions are sodium-calcium chloride brines with additions of magnesium and potassium salts, plus small amounts of many other chemical elements. The solutions range in concentration from a few percent to as much as 50 percent dissolved solids by weight. What is meant by foliated metamorphic rock? Foliated Metamorphic Rocks: (Foliated means the parallel arrangement
on April 1, 2022
How long did Mt St Helens erupt?
Regional SpecificsSummary of Events A wave of decreasing pressure down the volcanic conduit to the subsurface magma reservoir, which then began to rise, form bubbles (degas), and erupt explosively, driving a 9-hour long Plinian eruption. Steam-blast eruption from summit crater of Mount St. Helens. How long did Mount St. Helens erupt in 1980? Forty years ago,
on April 1, 2022
Where are mafic rocks commonly found?
Regional SpecificsINTRODUCTION. Mafic rocks that constitute the igneous oceanic crust are created at mid-ocean ridge seafloor spreading centers as a byproduct of partial melt from upwelling mantle. Where are mafic magmas most likely to be found? Mafic magmas are usually produced at spreading centers, and represent material which is newly differentiated from the upper mantle. Common
on April 1, 2022
Did Pennsylvania just have an earthquake?
Regional SpecificsThere were no significant confirmed earthquakes in or near Pennsylvania in the past 24 hours. When was the last earthquake in PA? Earthquake Catalog Date and time Mag Depth Location Aug 25, 2020 09:22 GMT 2.0 3.7 km Crawford County, Pennsylvania, 12 mi west of Meadville, USA Monday, June 1, 2020 GMT (1 quake) Jun