Could Australia’s bushfires aerosols actually decrease global temperature?
WildfireAsked by: Wendy Irvin Writing in the journal Geophysical Research Letters last week, scientists at the National Center for Atmospheric Research reported that those Australian fires poured so much smoke into the Southern Hemisphere’s atmosphere it triggered a “strong and rapid” global cooling effect of about 0.06°C ( 0.01°F). How much carbon did Australian bushfires
Is the Grand Canyon the “greatest” canyon in the world?
Earth scienceAsked by: Wendy Irvin Is the Grand Canyon the biggest canyon in the world? Grand Canyon occupies a large portion of northern Arizona and extends about 270 miles from Lees Ferry (just southwest of Lake Powell) to the Grand Wash Cliffs (just east of Lake Mead)–the longest canyon in the world. “Only” a mile a
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