Table of Contents
How do the land structures of Iceland help confirm seafloor spreading?
For example, by increasing temperature and therefore buoyancy, or by thickening the crust. If and when the mantle plume ceases, or moves away from the ridge, Iceland will gradually subside and submerge, even though seafloor spreading would simply continue.
Why is seafloor spreading important?
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.
What provides some of the most compelling evidence for sea floor spreading?
Seismic studies. More proof for sea floor spreading comes from seismic studies indicating that earthquakes occur along the rift valley of a midoceanic ridge and the crosscutting fractures that offset it.
What are the three pieces of evidence for seafloor spreading?
What three types of evidence provided support for the theory of sea floor spreading? eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
Why do you think it would be important to know what the seafloor looks like?
Sea floor sediment provide an invaluable key to past climate change. Finely varved sediments from areas of rapid deposition provide a high-resolution record of past climate variation, and volcanic ash layers contribute to the comprehensive study of climate change on relatively short timescales.
What are 3 things that we still do not know about the ocean floor?
- 7 Things We Still Don’t Know About Our Vast Oceans. Here are the mysteries kept by the seven seas!
- We don’t really know 1/3rd of the marine life. Source: Pexels.
- The Bermuda Triangle. Source: Arz/Wikimedia Commons.
- Baltic Sea Anomaly.
- The Upsweep Sound.
- Mariana Trench.
- The Phantom Island of Bermeja.
- Aegean Sea Ruins.
What kind of information can sediments reveal?
Deep-sea sediments can reveal much about the last 200 million years of Earth history, including seafloor spreading, the history of ocean life, the behaviour of Earth’s magnetic field, and the changes in the ocean currents and climate.
What can you say about the thickness of the sediments near the rage?
- thicker or thinner?
- its thicker.
- Sediment thickness increases away from mid-ocean ridges in proportion to the amount of time that has elapsed since that particular area of seafloor was created and moved laterally away from the spreading center, cooled and subsided.
What are the two principal types of sediment covering the crust?
Seafloor sediment consist mostly of terrigenous sediment, biogenous sediment and hydrogenous sediment. Terrigenous sediments form from sediments carried from the land into the ocean by water, wind or ice. Biogenous sediments contain at least 30 percent material from once-living marine organisms, especially plankton.
What are the two types of crust?
Earth’s crust is divided into two types: oceanic crust and continental crust. The transition zone between these two types of crust is sometimes called the Conrad discontinuity.
What are three types of ocean floor sediments?
There are three kinds of sea floor sediment: terrigenous, pelagic, and hydrogenous. Terrigenous sediment is derived from land and usually deposited on the continental shelf, continental rise, and abyssal plain.