on April 15, 2022
What does paleomagnetism tell us about Earth’s past?
Regional SpecificsThe record of the strength and direction of Earth’s magnetic field (paleomagnetism, or fossil magnetism) is an important source of our knowledge about the Earth’s evolution throughout the entire geological history. This record is preserved by many rocks from the time of their formation. What is paleomagnetism How does this help scientists understand the history
on April 15, 2022
What does seismic activity mean?
Regional SpecificsWhat seismic activity means? Seismic activity is defined as the types, frequency and size of earthquakes that happen over a period of time in a certain area. An example of seismic activity is how often earthquakes occur in the San Francisco Bay Area. noun. What is an example of seismic? The definition of seismic is
on April 15, 2022
How are foliated metamorphic rocks classified?
Regional SpecificsMetamorphic rocks are broadly classified as foliated or non-foliated. Non-foliated metamorphic rocks do not have aligned mineral crystals. Non-foliated rocks form when pressure is uniform, or near the surface where pressure is very low. How do you classify foliated metamorphic rocks? The various types of foliated metamorphic rocks, listed in order of the grade or
on April 15, 2022
What ended the Phanerozoic eon?
Regional SpecificsWhat happened Phanerozoic eon? The time span of the Phanerozoic starts with the sudden appearance of fossilized evidence of a number of animal phyla; the evolution of those phyla into diverse forms; the emergence and development of complex plants; the evolution of fish; the emergence of insects and tetrapods; and the development of modern fauna.
on April 15, 2022
Why is the inner core of the Earth solid and not liquid?
Regional SpecificsThe inner core is solid because it is made of very dense, or heavy, materials – like iron and nickel. Even though it is very hot, these materials don’t “melt” very easily, so they stay solid. Why is the inner core a solid and not a liquid? However, unlike the outer core, the inner core
on April 15, 2022
What does the Pycnocline separate?
Regional Specificspycnocline, in oceanography, boundary separating two liquid layers of different densities. In oceans a large density difference between surface waters (or upper 100 metres [330 feet]) and deep ocean water effectively prevents vertical currents; the one exception is in polar regions where pycnocline is absent. Why is the pycnocline important to plankton? Below the mixed