How long did it take for Earth’s magnetic field to first appear?
Earth scienceAsked by: Albana Ying How long ago did Earth’s magnetic field form? 3.5 billion years ago Multiple lines of evidence have shown that the Earth’s magnetic field existed at least 3.5 billion years ago. However, the planet’s core is thought to have started solidifying just 1 billion years ago, meaning that the magnetic field must
How do I get the velocity of the P-wave or S-wave without using the travel time graph?
Earth scienceAsked by: Albana Ying How do you find the velocity of P and S waves? The velocity of a P or S wave is a function of the physical properties of the rock the wave is traveling through.Velocity P wave = ((B + 1.3G)/Density)1/2, where: B = the bulk modulus – the resistance to change
What is the most powerful natural catastrophic event on record?
Earth scienceAsked by: Karen Handy Excessive rainfall over central China in July and August of 1931 triggered the most deadly natural disaster in world history — the Central China floods of 1931. What is the most powerful natural event? La Garita Caldera Eruption The most powerful eruption in the observable history of our planet the eruption
Can we define “drainage density” for a soil column (point-scale)?
Earth scienceAsked by: Karen Handy How is drainage density determined? Drainage density is a measurement of the sum of the channel lengths per unit area. It is generally expressed in terms of miles of channel per square mile. What is drainage density simple definition? The drainage density is the measure of the length of stream channel
How to estimate the settling time of atmospheric particulates as a function of aerodynamic size?
Earth scienceAsked by: Christina Cornwell What is the relationship between particle size and settling time? The settling velocity, and, as a result, settling time, are proportional to the diameter of the spherical particle squared. The larger the sphere diameter, the faster the particle will settle. The smaller the particle diameter, the longer it will stay suspended
Interpreting a geological map
Earth scienceAsked by: Christina Cornwell How is a geologic map interpreted? The purposes of a geologic map are to show the surface distributions of rock units, the locations of the interfaces or contacts between adjacent rock units, the locations of faults, and the orientations of various planar and linear elements. (Standard geologic symbols are shown in
When metamorphic rocks undergo pressure, how are they changed?
Earth scienceAsked by: Richard Agosta 4 Answers. Show activity on this post. Metamorphic rocks are formed when a rock (sedimentary, igneous or a previous metamorphic rock) comes under high pressure and/or temperature. Pressure and temperature forces the atoms to form new minerals and thereby a new kind of rock. How does pressure change metamorphic rocks? Metamorphism
Is it ever possible for an continental plate to subduct under an oceanic plate?
Earth scienceAsked by: Richard Agosta Is it possible for a continental plate to Subduct beneath an oceanic plate? Neither continental crustcontinental crustIn geology, the term sial refers to the composition of the upper layer of Earth’s crust, namely rocks rich in aluminium silicate minerals. It is sometimes equated with the continental crust because it is absent
Has there ever been a study done on the effect of steam/thermal pollution on climate
Earth scienceAsked by: John Castaneda How does thermal pollution affect climate change? Such thermal pollution contributes to global warming until the global temperature has reached a level where this heat is also emitted to space. Heat dissipation from the global use of fossil fuels and nuclear power is the main source of thermal pollution. Is climate
How hot would days get if it were always the solstice in the northern hemisphere?
ClimateAsked by: John Castaneda Why are temperatures warmer in the Northern Hemisphere during the June solstice? The sun reaches its highest and northernmost point in the sky at solar noon (around 1 p.m. local time due to Daylight Saving Time) on the summer solstice. This provides the most direct solar radiation of the year, resulting