Exploring Seafloor Spreading Evidence

What geological feature is formed at mid-ocean ridges?

• Continental shelves

• Volcanic islands

• New oceanic crust

• Subduction zones

How does paleomagnetism provide evidence for seafloor spreading?

• Paleomagnetism shows symmetrical magnetic stripes on either side of mid-ocean ridges, indicating seafloor spreading.

• Paleomagnetism reveals the age of oceanic crust only.

• Paleomagnetism indicates the direction of ocean currents.

• Paleomagnetism shows the temperature changes in ocean water.

What is the relationship between the age of oceanic crust and distance from the mid-ocean ridge?

• The age of oceanic crust decreases with distance from the mid-ocean ridge.

• The age of oceanic crust varies randomly with distance from the mid-ocean ridge.

• The age of oceanic crust increases with distance from the mid-ocean ridge.

• The age of oceanic crust is constant regardless of distance from the mid-ocean ridge.

What techniques are used to map seafloor topography?

• Magnetic resonance imaging

• Thermal imaging

• Seismic wave analysis

• Sonar, satellite altimetry, underwater drones, and ROVs.

How do magnetic reversal patterns support the theory of seafloor spreading?

• Magnetic reversal patterns show symmetrical stripes on either side of mid-ocean ridges, supporting seafloor spreading.

• Magnetic reversal patterns only occur in land-based geological formations.

• Magnetic reversal patterns are random and do not show any symmetry.

• Magnetic reversal patterns indicate a fixed position of continents.

What type of earthquakes are commonly associated with mid-ocean ridges?

• Deep-focus earthquakes

• Tsunami-triggered earthquakes

• Volcanic earthquakes

• Shallow-focus earthquakes

What is the significance of the Mid-Atlantic Ridge in seafloor spreading?

• It marks the boundary between continental and oceanic crust.

• It is the site of the deepest ocean trench.

• The Mid-Atlantic Ridge is significant in seafloor spreading as it is the location where new oceanic crust is formed, driving the movement of tectonic plates.

• It is where tectonic plates converge and collide.

How do scientists use rock samples to determine the age of oceanic crust?

• Scientists use radiometric dating of rock samples to determine the age of oceanic crust.

• Scientists compare rock samples to surface rocks for dating.

• Scientists use seismic waves to measure the age of oceanic crust.

• Scientists analyze the mineral composition of rock samples.

How can the study of magnetic minerals in rocks help us understand Earth's history?

• It helps identify the age of fossils in sedimentary layers.

• It reveals past magnetic field orientations, aiding in understanding tectonic movements and geological history.

• It provides insights into the color variations of rocks over time.

• It determines the chemical composition of minerals in rocks.

What evidence do earthquakes provide about the movement of tectonic plates?

• Earthquakes provide evidence of tectonic plate movement by indicating the locations and types of plate boundaries where stress is released.

• Earthquakes only occur in oceanic regions and provide no evidence of plate movement.

• Earthquakes are caused by volcanic activity unrelated to tectonic plates.

• Earthquakes indicate the age of tectonic plates rather than their movement.