on April 2, 2022
Why are sedimentary rocks The most important rocks for humans?
Regional SpecificsSedimentary rocks are also important sources of natural resources including coal, fossil fuels, drinking water and ores. The study of the sequence of sedimentary rock strata is the main source for an understanding of the Earth’s history, including palaeogeography, paleoclimatology and the history of life. Why is sedimentary important? Sediment is important because it often
on April 2, 2022
What is the most explosive type of magma?
Regional SpecificsThe largest and most violent of all the types of volcanic eruptions are Plinian eruptions. They are caused by the fragmentation of gassy magma, and are usually associated with very viscous magmas (dacite and rhyolite). What is explosive magma? Explosive eruptions occur where cooler, more viscous magmas (such as andesite) reach the surface. Dissolved gases
on April 2, 2022
What type of cleavage does hornblende have?
Regional SpecificsImperfect Hornblende Crystal habit Hexagonal/granular Cleavage Imperfect at 56° and 124° Fracture Uneven Mohs scale hardness 5–6 How many cleavage does hornblende have? two perfect cleavages Hornblende is black and, like all amphibole minerals, is characterized by two perfect cleavages that intersect at about 60° or 120°. Does hornblende have good cleavage? Hornblende minerals as
on April 2, 2022
How old are humans in relation to the age of the Earth?
Regional SpecificsWhile our ancestors have been around for about six million years, the modern form of humans only evolved about 200,000 years ago. Civilization as we know it is only about 6,000 years old, and industrialization started in the earnest only in the 1800s. How long have humans been on Earth compared to the age of
on April 2, 2022
Where was the metamorphosis written?
Regional SpecificsAustria-Hungary…The Metamorphosis. Front cover of a 1916 edition Author Franz Kafka Original title Die Verwandlung Country Austria-Hungary (now the Czech Republic) Language German When and where was Metamorphosis written? It came out in October 1915, and then appeared in December 1915 (though dated 1916) as a slender volume published by Kurt Wolff Verlag in Leipzig.
on April 2, 2022
What is the cause of volcanism?
Regional SpecificsVolcanism occurs because of Earth’s internal heat, and is associated with tectonic processes and a part of the rock cycle. Volcanic eruptions occur when molten lava reaches the surface of the Earth. When lava cools at the surface it is called extrusive igneous rock. Volcanism can both increase and decrease temperature. What are the causes