Which of the following best describes Shiprock, a famous volcanic feature in New Mexico?
the eroded remains of a volcanic pipe and radiating dikes
Which region has the greatest concentration of currently active volcanoes?
the circum-Pacific area
What type of volcanic material is indicative of eruption under water quizlet?What type of volcanic material indicates an eruption under water? Contrast a pyroclastic flow and a lahar. Pyroclastic flow is a fast moving avalanche that occurs when hot volcanic ash and debris mix with air and flow down the side of a volcano.
Is an intrusive igneous rock body that is tabular and concordant?A sill is a tabular body which is concordant. A blister shaped sill is called a laccolith. A pegmatite is a extremely coarse-grained igneous rock with crystals as large as 10 meters across.
Which of the following best describes melting of the mantle at subduction zones?Which of the following best describes melting of the mantle at subduction zones that leads to island arc volcanos? Water released from the subducting plate decreases the melting temperature in the mantle above the downgoing plate to generate magmas from the overlying mantle wedge.
Table of Contents
Which of the following best describes Shiprock? – Additional Questions
Which of the following best describes the melting of the mantle at subduction zones that lead to island arc volcanoes?
Which of the following best describes melting of the mantle at subduction zones that leads to island arc volcanos? Water released from the subducting plate decreases the melting temperature in the mantle above the downgoing plate to generate magmas from the overlying mantle wedge.
Which of the following are processes that can occur in large magma chambers quizlet?
Processes that can occur in large magma chambers: – Magma may partially melt the chamber’s rock walls, forming a new magma composition. – Crystals that form may sink or rise in the chamber.
What happens to material that is hotter than its surrounding material deep within the earth?
What happens to material that is hotter than its surrounding material deep within the Earth? The hot material slowly moves up toward the surface.
Which type of plate boundary is characterized by arcs of Stratovolcanoes and deep ocean trenches?
Term _______was the flora that was widely distributed throughout the once contiguous,, late Paleozoic Southern Hemisphere landmass.
Term characterized by arcs of stratovolcanoes and deep- ocean trenches
Term the Mid-Atlantic Ridge
Which part of the earth is composed of both the crust and the rigid mantle?
The lithosphere includes both the crust and the brittle upper portion of the mantle. The lithosphere is both the coolest and the most rigid of Earth’s layers.
Are the oldest rocks on the seafloor much younger than the oldest rocks on the continents?
The oldest rocks on the seafloor are much younger than the oldest rocks on the continents. The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active, mid-ocean ridges. In general, rocks of the continental crust are less dense than rocks of the oceanic crust.
How can you tell which rocks are older younger with respect to the location from the mid-ocean ridges?
To confirm the ages obtained with magnetic records, and get an absolute age of the seafloor, scientists use the radioactive dating technique. When the lava solidifies at the ridges to form the new seafloor, radioactive elements coming from the mantle are trapped in it.
When compared to the oldest rocks continental the oldest rocks on the ocean floor are quizlet?
The oldest rock in the ocean floor is about 200 million years old. In contrast, the oldest rock in the continents is about 4 billion years old.
How would the age of the oldest rocks on the continents compared with the age of the oldest rocks on the seafloor?
How then, would the age of the oldest rocks on the continents compare to the age of the oldest rocks on the seafloor? The oldest continental rocks would be older that the oldest rocks on the sea floor.
How do the ages of these sediments compare to the ages of the oldest continental rocks?
How do the ages of these sediments compare to the ages of the oldest continental rocks? Newer oceanic floor was near the ridge crest.As you went deeper, the sediment grew older.Older crust was found next to continents.
How does the age of the oldest continental crust compared to the age of the oldest ocean crust?
The oldest existing oceanic crust is in the Ionian Sea, part of the eastern Mediterranean basin. The seafloor of the Ionian Sea is about 270 million years old. (The oldest parts of continental crust, on the other hand, are more than 4 billion years old.)
Where would you be most likely to find the oldest rocks on Earth?
Bedrock along the northeast coast of Hudson Bay, Canada, has the oldest rock on Earth.
How old is the earth?
4.543 billion years
Earth / Age
Is Earth a rock?
It’s firm and hard like other rock, but it’s actually flowing very slowly, about as slowly as your fingernails grow. The outer core is a liquid layer, made mostly of iron and nickel, that moves around the inner core. This motion causes Earth to act like a giant magnet.
What is the oldest rock ever found on Earth?
In 1999, the oldest known rock on Earth was dated to 4.031 ±0.003 billion years, and is part of the Acasta Gneiss of the Slave craton in northwestern Canada.
When was the Earth born?
Formation. When the solar system settled into its current layout about 4.5 billion years ago, Earth formed when gravity pulled swirling gas and dust in to become the third planet from the Sun. Like its fellow terrestrial planets, Earth has a central core, a rocky mantle, and a solid crust.
What is the Colour of a rock?
If rocks are deposited in shallow water, they may be more greenish or brown. Rocks deposited on land instead of under water are more oxidized, especially if they were deposited in wet environments, and so tend to be reddish or tan. White rocks can be formed in sand dunes, beaches, lakes, and shallow sea.