on April 2, 2022
Which type of volcano has side vents?
GeologyStratovolcano. Stratovolcanoes have relatively steep sides and are more cone-shaped than shield volcanoes. They are formed from viscous, sticky lava that does not flow easily. The lava therefore builds up around the vent forming a volcano with steep sides. Which volcano has a side vent? Nyiragongo volcano (DR Congo): side vent inside crater again active,
on April 2, 2022
What is the most recent eon?
Geologythe Phanerozoicthe Phanerozoic, which began about 540 million years ago. This eon is very distinct from the previous three—the Hadean, Archean, and Proterozoic—which are sometimes known as the Precambrian era. What are the 4 eons in order? For example, the entire age of the earth is divided into four eons: the Hadean Eon, the Archean
on April 2, 2022
Where are subduction zones?
GeologySubduction zones occur all around the edge of the Pacific Ocean, offshore of Washington, Canada, Alaska, Russia, Japan and Indonesia. Called the “Ring of Fire,” these subduction zones are responsible for the world’s biggest earthquakes, the most terrible tsunamis and some of the worst volcanic eruptions. What plates have subduction zones? Only oceanic plates, which
on April 2, 2022
What are the 8 properties used to identify minerals?
GeologyMost minerals can be characterized and classified by their unique physical properties: hardness, luster, color, streak, specific gravity, cleavage, fracture, and tenacity. What are the 10 mineral properties? These include: color, streak, hardness, luster, diaphaneity, specific gravity, cleavage, fracture, magnetism, solubility, and many more. These physical properties are useful for identifying minerals. What are the
on April 2, 2022
Is hematite a stone or metal?
GeologyHematite is a natural stone that is often used to balance and support the healing of your body and your home when used with feng shui intention. The dark color can be used to protect and absorb any negative energies in your home. Is hematite a natural stone? Hematite is a natural stone that is
on April 2, 2022
What are the 4 eras of Earth history?
GeologyEarth’s history is characterized by four eons; in order from oldest to youngest, these are the Hadeon, Archean, Proterozoic, and Phanerozoic. What are the 4 major eras in Earth’s history in order? The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras The Geologic Time Scale is the history of the Earth broken down into four spans of
on April 2, 2022
Why are sedimentary rocks The most important rocks for humans?
GeologySedimentary 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?
GeologyThe 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?
GeologyImperfect 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?
GeologyWhile 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