Unit 2 M1L2

What is an Echo Sounder?

• An organ found in bats that allows them to navigate their environment using sound.

• A device that measures the reverberations of a room by measuring how long an echo is sustained.

• A system for the detection of objects under water and for measuring the water's depth by emitting sound pulses and detecting or measuring their return after being reflected.

• A device that produces sound waves that travel from a ship to the seafloor and back; used to map the ocean floor

What is an Sonar?

• An organ found in bats that allows them to navigate their environment using sound.

• A device that measures the reverberations of a room by measuring how long an echo is sustained.

• A system for the detection of objects under water and for measuring the water's depth by emitting sound pulses and detecting or measuring their return after being reflected.

• A device that produces sound waves that travel from a ship to the seafloor and back; used to map the ocean floor

What are Ocean Trenches?

• Vast mountain ranges deep below the ocean’s surface.

• Deep underwater troughs (canals) on the ocean floor.

• Military positions on the ocean used during World War I

• Structures that help cities prevent flooding due to sea levels rising

What are Mid-Ocean Ridges?

• Vast mountain ranges deep below the ocean’s surface.

• Deep underwater troughs (canals) on the ocean floor.

• Military positions on the ocean used during World War I

• Structures that help cities prevent flooding due to sea levels rising

What is Seafloor Spreading?

• The theory that states that Earth’s surface is made of rigid slabs of rock, or plates, that move with respect to each other.

• The process by which new oceanic crust continuously forms along mid-ocean ridges and is destroyed at ocean trenches.

• The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle again.

• The process by which land rises and falls

What is Plate Tectonics?

• The theory that states that Earth’s surface is made of rigid slabs of rock, or plates, that move with respect to each other.

• The process by which new oceanic crust continuously forms along mid-ocean ridges and is destroyed at ocean trenches.

• The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle again.

• The process by which land rises and falls

What is the definition of Dense?

• Not getting a clue that someone has a crush on you

• Having high density in a large space

• Having high weight per unit of volume, being very loosely packed in a small space

• Having high mass per unit of volume; being very tightly packed in a small space