What are rocks farther from ocean ridges?
The scientists found that the farther the rocks the older the rocks were,so the youngest rocks were found near the mid-ocean ridge. This showed that sea-floor spreading took place because that fact that rocks were because pushed out showed us that the sea-floor was spreading.
What happens to the rocks as you get farther from mid oceanic ridges?
As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.
What type of rocks are found at the Mid-Ocean Ridge?
As old oceanic crust is subducted and melted into magma, new oceanic crust in the form of igneous rock is formed at mid-ocean ridges and volcanic hotspots.
Why are rocks next to the Mid-Ocean Ridge younger than the rocks that are farther away from mid ocean ridge?
How did scientists discover that rocks farther away from the mid-ocean ridge were older that those near the ridge? Oceanic crust near the mid-ocean ridge is younger than the crust farther from the ridge. The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle.
Where are the major mid ocean ridges located?
South Pacific Ocean
What types of volcanoes form at mid ocean ridges?
Characteristics of submarine basaltic eruptions MID-OCEAN RIDGES, NEAR-RIDGE SEAMOUNTS, HOT SPOT VOLCANOES, CALIFORNIA MARGIN SEAMOUNTS – Basaltic volcanism in the deep oceans has long been thought to consist of quietly effusive discharge of lava to form pillow, lobate, and sheet flows.
What kind of rock is the seafloor made?
The seafloor is made of volcanic rock that solidified from magma and/or lava.
Which is thicker continental crust or oceanic?
Continental crust is typically 40 km (25 miles) thick, while oceanic crust is much thinner, averaging about 6 km (4 miles) in thickness. The less-dense continental crust has greater buoyancy, causing it to float much higher in the mantle.
What is an example of continental crust?
The continental crust is the layer of granitic, sedimentary and metamorphic rocks which form the continents and the areas of shallow seabed close to their shores, known as continental shelves. About 40% of the Earth’s surface is now underlain by continental crust.
What are three differences between continental and oceanic crust?
Continental crust is low in density whereas oceanic crust has a higher density. continental crust is thicker, on the contrary, the oceanic crust is thinner. Continental crust floats on magma freely but oceanic crust floats on magma scarcely. Continental crust cannot recycle whereas oceanic crust can recycle it.
What are the similarities and differences between oceanic and continental crust?
- The oceanic crust is made up of basalt while the continental crust is made up of granite.
- The oceanic crust is thinner while the continental crust is much thicker.
- The oceanic crust is denser than the continental crust.
- The continental crust has greater buoyancy than the oceanic crust.
What are the similarities and differences between the oceanic crust and continental crust?
The continental crust is made mostly of rocks with a composition similar to granite (a light-colored rock you would expect to find in the Sierra Nevada), whereas the oceanic crust is made mostly of rocks with a composition of basalt (a dark- colored rock, like the rocks that make up the Hawaiian volcanoes).