How do we know earth’s outer core is liquid?
Regional SpecificsBy tracking seismic waves, scientists have learned what makes up the planet’s interior. P-waves slow down at the mantle core boundary, so we know the outer core is less rigid than the mantle. S-waves disappear at the mantle core boundary, so the outer core is liquid. How do we know that Earth’s core is liquid?
What is the difference between constructive and destructive plate boundary?
Regional SpecificsThey are called constructive plates because when they move apart, magma rises up in the gap- this forms volcanoes and eventually new crust. One example is the Mid-Atlantic Ridge, where the gap can be found in Thingvellir, Iceland. Destructive plate boundaries are when oceanic and continental plates move together. What is the difference between a
What types of organisms lived during the Archean eon?
Regional SpecificsLife in the Archean was limited to simple single-celled organisms (lacking nuclei), called prokaryotes. In addition to the domain Bacteria, microfossils of the domain Archaea have also been identified. What type of organism was most common during the Archean eon? These organisms were prokaryotes, a group of unicellular organisms with rudimentary internal organization that began
What type of boundary exists between the Philippine plate and the Pacific plate?
Regional Specificsconvergentconvergent. The Pacific plate is subducting beneath the Philippine Sea plate to the east while the west/northwestern part of the Philippine Sea plate is subducting beneath the continental Eurasian plate. Which plate boundary is formed between the Philippine plate and the Pacific Plate? It is separated from the Philippine Sea Plate to the west by
Which isotope is used to determine the age of Earth?
Regional SpecificsThe best-known radiometric dating method involves the isotope carbon-14, with a half life of 5,730 years. How do we determine the age of the Earth? So, just how old is Earth? By dating the rocks in Earth’s ever-changing crust, as well as the rocks in Earth’s neighbors, such as the moon and visiting meteorites, scientists
Is there earthquakes in Italy?
Regional SpecificsHow common are earthquakes in Italy? In the past 1,000 years, there have been about 260 earthquakes of magnitude Mw equal to or greater than 5.5 — on average once every four years. Besides natural plate movements, fracking is also a possible cause of the latest seismic phenomenon in regions like Emilia Romagna. Does Italy