Posted on April 16, 2022 (Updated on July 9, 2025)
What period did Ammonite live in?
Regional SpecificsJurassicJurassic and Cretaceous. Together, these represent a time interval of about 140 million years. The Jurassic Period began about 201 million years ago and the Cretaceous Period ended about 66 million years ago. Did ammonites live in the Mesozoic Era? Evolution and extinction As ammonites evolved throughout the Mesozoic era, between 252 and 66 million
Posted on April 16, 2022 (Updated on July 9, 2025)
When did the Columbia River basalts form?
Regional Specificsabout 17 million years agoabout 17 million years ago. How old is the Columbia River Basalt? 16.7 million years old The Columbia River Basalts (CRBs) are a series of broad lava flows known as flood basalts . The CRBs currently cover large portions of southeast Washington, northeast Oregon and western Idaho. At 16.7 million years
Posted on April 16, 2022 (Updated on July 9, 2025)
What was the cause of the Great Hanshin Earthquake?
Regional SpecificsThe great Hanshin earthquake was caused by plate motion under Hanshin area. The inland shallow earthquake type decides its severe damage to cities such as Kobe and Osaka, by both shocking waves and soil liquification. What plates caused the Great Hanshin Earthquake? The Kobe quake was a result of an east-west strike-slip fault where the
Posted on April 16, 2022 (Updated on July 9, 2025)
What are the characteristics of a clastic sedimentary rock?
Regional SpecificsClastic sedimentary rocks are named according to the characteristics of clasts (rock and mineral fragments) that comprise them. These characteristics include grain size, shape, and sorting. How do you identify a clastic sedimentary rock? Clastic sedimentary rocks are subdivided on the basis of grain size. Secondary characteristics used to further distinguish clastic rocks are sorting,
Posted on April 16, 2022 (Updated on July 9, 2025)
Where is Galena found in the world?
Regional SpecificsGalena deposits are found in France, Romania, Austria, Belgium, Italy, Spain, Scotland, England, Australia, and Mexico. Noted deposits include those at Freiberg, Saxony; Cornwall, Derbyshire, and Cumberland, England; the Sullivan mine of British Columbia; and Broken Hill, Australia. Is Galena rare on Earth? Galena is a rare mineral in some granitic pegmatites. It is also
Posted on April 16, 2022 (Updated on July 9, 2025)
How does Magma turn into extrusive igneous rock?
Regional SpecificsExtrusive Igneous Rocks: Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth’s surface. These are the rocks that form at erupting volcanoes and oozing fissures. What is the example of extrusive igneous rock? Types of extrusive igneous rocks include: pumice, obsidian, andesite, rhyolite, and basalt. What