Question

Which are evidence of seafloor spreading? Check all that apply. molten material magnetic stripes continent material drilled core samples ocean water samples

Answer 1

Molten materials and magnetic stripes are the evidence of seafloor spreading.

• When scientists studied patterns in the rocks of the ocean floor, they found more support for sea-floor spreading.
• In 1960, scientist dived to the ocean floor in Alvin. In a ridge's central valley, Alvin;s crew found strange rock shape pillows or like toothpaste squeezed from tube. Such rocks form only when molten materials hardens quickly after erupting under water. These rocks shows that molten materials has erupted again and again along mid ocean ridge.

Answer 2

The evidence of seafloor spreading from the choices given are;

• Molten material
• Magnetic stripes
• Drilled core samples

Further Explanation;

Seafloor spreading  

• Seafloor spreading is a geological process that involves the gradual addition of new oceanic crust in the oceanic floor while moving older rocks away from the mid-oceanic ridge. In other words, it is the process in which the tectonic plates on the oceanic floor move apart from each other.
• The process occurs when the seafloor spreads apart along divergent boundaries and forms the mid-ocean ridge.
• Magma is pushed up through cracks in the crust along the mid-ocean ridge. As the magma is thrust up and hardens it forms the new crust and the ocean floor on both sides of the mid-ocean ridge move outward.

Evidence of seafloor spreading  

1. Rocks near mid-ocean ridge were younger than rock near trenches. Rocks away from the mid-oceanic ridges are relatively older than those near it.  

Additionally, the older rocks are denser and thicker compared to thinner and less dense rocks near the mid-oceanic ridge.

2. Matching bands of magnetic rocks were found on either side the mid-ocean ridge; bands like tree rings - record changes in earth's magnetic field over time.

This means sea floor contains different rocks based on ages and are positioned equally in opposite directions. This indicates that there is constant movement and spreading of rocks on the ocean floor.

3. Earthquake data showed oceanic crust is sinking on to the mantle at trenches.  

Keywords: Seafloor spreading, evidence of seafloor spreading  

Learn more about;

• Seafloor spreading: https://brainly.com/question/12537430
• Evidence of seafloor spreading: https://brainly.com/question/12537430

Level: High school  

Subject: Geography  

Topic: Geology  

Sub-topic: Seafloor spreading