Why are seafloor sediments useful in the study of past climates there are many reasons briefly describe at least 2 of them?
Why are seafloor sediments useful in the study of past climates? … Since the numbers and types of organisms living near the sea surface vary as climate (especially temperature) fluctuates, sea-floor sediments hold important clues to changes in climate through time.
Which type of seafloor resource is presently most valuable?
Oil and natural gas are the most valuable non-living resources taken from the ocean. Extracting these resources requires drilling into the seafloor.
Ocean trenches form where crustal plates plunge back into the mantle. Thus, these long, narrow depressions are associated with convergent plate boundaries.
What is salinity and how is it usually expressed what is the average salinity of seawater quizlet?
Salinity is a measure of the total dissolved material in water. It is usually expressed in parts per thousand. The average salinity of the ocean is 35 parts per thousand.
Why are seafloor sediments useful in the study of past climates aside from seafloor sediments list four sources of proxy climate data?
Aside from seafloor sediments, list four sources of proxy climate data. Additional proxy data may include glacial ice, fossil pollen, and tree-growth rings, as well as historical documents. Seafloor sediments are great for use in oxygen-isotope analysis to determine past temperatures.
How can sediments be used to study past climates?
Climate scientists use “proxy data” to study climates of the past, before humans with thermometers began keeping temperature records. … The amount and types of organic debris in the sediments can help us determine the types of plants that grew nearby, which gives us another insight into the local climate of the past.
Why is it important to study the seafloor?
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 is the value in studying the ocean floor?
Information from ocean exploration can help us understand how we are affecting and being affected by changes in Earth’s environment, including changes in weather and climate. Insights from ocean exploration can help us better understand and respond to earthquakes, tsunamis, and other hazards.
Why do you think mapping the seafloor is important to the Navy? Explain. So that they know what they may run into and understand where they are and will be going. … Underwater mountains include undersea volcanoes (called seamounts), which may rise more than 1,000 meters above the ocean floor.
Which type of sediment can be used to reconstruct past climate change?
Lake and ocean sediments
These materials are deprived of oxygen and are thus preserved as tiny fossils and chemicals in the sediments and can be used to interpret past climate. Scientist drill cores of sediments buried below the ocean floor in order to get a sequence of changing climate over time.
How does the seafloor form at the mid-ocean ridge?
Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.