# Do sonar uses sound waves to measure water depth?

## Do sonar uses sound waves to measure water depth?

The most common and fastest way of measuring ocean depth uses sound. Ships using technology called sonar, which stands for sound navigation and ranging, can map the topography of the ocean floor. The device sends sound waves to the bottom of the ocean and measures how long it takes for an echo to return.

### Does the thickness of ocean floor sediments decrease with distance from an ocean ridge?

The thickness of ocean-floor sediments decreases with distance from an ocean ridge.

#### How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading?

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading? They show how the density of the seafloor has changed. They reveal a matching pattern on either side of the ridge. They reveal differences in the mineral composition of newly created rock.

How do magnetic minerals help support the theory of seafloor spreading?

Iron bearing minerals support seafloor spreading because they can record the earth’s magnetic field direction when they form. hot, less-dense material rises toward the surface at mid ocean ridges, then it flows sideways carrying the seafloor away from the ridge in both directions.

Which type of waves are used in sonar?

So, ultrasound or ultrasonic waves are used in SONAR. So, the correct answer is A) Ultrasonic waves.

## Which two tectonic plates are separated by a mid-ocean ridge?

Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor. The Mid-Atlantic Ridge, for instance, separates the North American plate from the Eurasian plate, and the South American plate from the African plate.

### What can you say about the thickness of the sediments far the ridge?

As you move away from the ridge spreading center the sediments get progressively thicker (see section 4.5), increasing by approximately 100-200 m of sediment for every 1000 km distance from the ridge axis.

#### Which is one piece of evidence of seafloor spreading?

There is lots of evidence that proves that seafloor spreading is occurring. One piece of evidence is mid-ocean ridges. Rocks found near mid-ocean ridges are young and get older as the distance from the ocean ridge increases.

What is magnetic stripes on the seafloor?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges. These patterns of stripes provide the history of seafloor spreading.

How did sonar and magnetometer lead to the discovery of deep sea trenches?

Maps made from sonar and magnetometer data led to the discovery of ocean ridges and deep-sea trenches. True or False Nice work! You just studied 22 terms!

## What are mid ocean ridges and deep sea trenches?

T (T/F) Maps made form sonar and magnetometer data led to the discovery of ocean ridges and deep-sea trenches. mid ocean ridges ____________ are vast, underwater mountain chains. younger Rock samples taken near ocean ridges are _____ than rock samples taken near deep-sea trenches. increases

### How is sonar used to measure water depth?

Terms in this set (22) Sonar uses sound waves to measure water depth. Maps made from sonar and magnetometer data led to the discovery of ocean ridges and deep-sea trenches. Deep-sea trenches are vast, underwater mountain chains. Rock samples taken near ocean ridges are older than rock samples taken near deep-sea trenches.

#### What is study of magnetic record preserved in Earths rocks called?

(T/F) The study of magnetic record preserved in Earth’s rocks is called paleomagnetism. ocean ridge The magnetic patterns on either side of a(an) _________ are mirror images of each other. sea floor spreading The theory of ______ states that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches.