on April 16, 2022
How are continental rifts formed?
GeologyWhere tectonic plates move away from one another the lithosphere thins. The underlying asthenosphere rises and expands like a hot-air balloon, elevating a broad region. If the plate is capped by thick continental crust, the resulting continental rift zone rises high above sea level. Where does continental rift occur? Major rifts occur along the central
on April 16, 2022
What kind of weathering is associated with rock dissolution?
Geologychemical weatheringchemical weathering. Over time, the action of slightly acidic solutions on the rock can leave pits and holes, and it can act to slowly enlarge and widen preexisting fractures. What causes dissolution weathering? Several factors cause chemical weathering. These factors include water, oxygen, acids, carbon dioxide, and organisms that are living on Earth. These
on April 16, 2022
Did ammonites live underwater?
GeologyQuick answer Ammonites lived all around the world. Like their modern-day cephalopod relations, they were exclusively ocean-dwelling. They tended to live in more shallow seas and may have had a maximum depth of about 400 metres. Ammonites were marine creatures that lived underwater. They were a type of extinct cephalopod that lived during the Jurassic
on April 16, 2022
Which is the largest division of time on the geologic time scale?
GeologyEonsEons are the largest intervals of geologic time and are hundreds of millions of years in duration. In the time scale above you can see the Phanerozoic Eon is the most recent eon and began more than 500 million years ago. Eons are divided into smaller time intervals known as eras. What is the largest
on April 16, 2022
What equipment is used to monitor volcanoes?
GeologySeismographsSeismographs. Seismographs measure movement in the planet’s crust. Volcanic eruptions are closely related to the seismic activities that also cause earthquakes and tremors, so seismographs are also often used to monitor volcanoes. How do they monitor volcanoes? Scientists use a wide variety of techniques to monitor volcanoes, including seismographic detection of the earthquakes and tremor
on April 16, 2022
Where is goethite found?
GeologyGoethite is the source for the pigment known as yellow ochre; it is also the primary mineral in some important iron ores, such as those in the Alsace-Lorraine basin in France. Other important goethite deposits are found in the southern Appalachians, U.S.; Brazil; South Africa; Russia; and Australia. What type of rock is goethite found
on April 16, 2022
What is the center of an earthquake called?
GeologyThe focus is the place inside Earth’s crust where an earthquake originates. The point on the Earth’s surface directly above the focus is the epicenter. Is the epicenter the center of an earthquake? The epicenter is the point on the earth’s surface vertically above the hypocenter (or focus), point in the crust where a seismic
on April 16, 2022
What is the hardness of schist?
Geology4 to 5From 4 to 5 on the Moh’s scale, which is only indicative of its relative hardness against other rocks and minerals. Is schist a hard rock? Texture – foliated, foliation on mm to cm scale. Grain size – fine to medium grained; can often see crystals with the naked eye. Hardness – generally
on April 16, 2022
What type of rock forms when heat and great pressure beneath Earth’s surface is applied to igneous or sedimentary rock?
GeologyMetamorphic rocksMetamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet. What type of rock is formed by the action of heat and pressure beneath the Earth’s crust
on April 16, 2022
Which is the hardest mineral in the world?
GeologyDiamondDiamond is a high-symmetry allotrope of carbon (C). It has a Mohs “scratch” hardness of 10, which makes it the hardest mineral known to date. Because the Mohs scale is not absolute, diamond is actually about five times harder than no. 9 (corundum) and some 700 times harder than talc (no. Which is the hardest