Question

lesson 2

• scientists used a device called an ____ to measure ocean depths.(2)
• this device produces ____ that travel from a ship to the seafloor.(2)
• scientists created ____ maps of the seafloor using this data. (2)
• mountain ranges in the middle of oceans are called ____.(3)
• deep underwater valleys are called ocean ____.(3)
• the __ __ in the pacific ocean is the deepest landform on earth. (3)
• scientists created ____ maps showing points of the same age on the seafloor. (4)
• the youngest ocean crust is near __ __.(4)
• older ocean crust is found along ocean ____.(4)
• the seafloor ____ as you move further away from a mid - ocean ridge. (4)
• __ __ is the process by which new oceanic crust forms along mid - ocean ridges.(5)
• molten rock below earths surface is called ____. (6)
• when magma reaches earths surface, its called ____.(6)
• as lava cools on the seafloor, it forms new ____ crust.(6)
• the two halves of oceanic crust spread apart like a ____.(6)
• the cold and rigid outermost rock layer is called the ____.(8)
• the lithosphere includes the crust and the solid, uppermost ____.(8)
• earths __ __ are large pieces of lithosphere.(8)
• below the lithosphere is the hot ____, which flows and enables plates to move.(9)

lesson 3

• a ____ boundary forms when two plates collide. (4)
• a ____ boundary forms when two plates separate.(5)
• a ____ boundary forms when two plates slide past each other.(6)
• when a dense oceanic plate collides with a less - dense continental plate, the denser plate ____ under the other plate.(4)
• this process is called ____. (4)
• when two continental plates collide, large __ __ form.(8)
• the plates fold or crumple upward, forming ____ mountains.(8)

Explanation:

This is a fill - in - the - blanks worksheet about oceanography and plate tectonics. Knowledge of scientific terms related to measuring ocean depths, sea - floor features, and plate boundaries is required. For example, sonar is used to measure ocean depths, producing sound waves. Mid - ocean ridges are mountain ranges in the middle of oceans, and the deepest landform in the Pacific Ocean is the Mariana Trench. Plate boundaries include convergent (plates collide), divergent (plates separate), and transform (plates slide past each other).

Answer:

• Scientists used a device called an sonar to measure ocean depths.
• This device produces sound waves that travel from a ship to the seafloor.
• Scientists created bathymetric maps of the seafloor using this data.
• Mountain ranges in the middle of oceans are called mid - ocean ridges.
• Deep underwater valleys are called ocean trenches.
• The Mariana Trench in the Pacific Ocean is the deepest landform on Earth.
• Scientists created age - of - crust maps showing points of the same age on the seafloor.
• The youngest ocean crust is near mid - ocean ridges.
• Older ocean crust is found along ocean trenches.
• The seafloor ages as you move further away from a mid - ocean ridge.
• Seafloor spreading is the process by which new oceanic crust forms along mid - ocean ridges.
• Molten rock below Earth's surface is called magma.
• When magma reaches Earth's surface, it's called lava.
• As lava cools on the seafloor, it forms new oceanic crust.
• The two halves of oceanic crust spread apart like a conveyor belt.
• The cold and rigid outermost rock layer is called the lithosphere.
• The lithosphere includes the crust and the solid, uppermost mantle.
• Earth's tectonic plates are large pieces of lithosphere.
• Below the lithosphere is the hot asthenosphere, which flows and enables plates to move.
• A convergent boundary forms when two plates collide.
• A divergent boundary forms when two plates separate.
• A transform boundary forms when two plates slide past each other.
• When a dense oceanic plate collides with a less - dense continental plate, the denser plate subducts under the other plate.
• This process is called subduction.
• When two continental plates collide, large folded mountains form. The plates fold or crumple upward, forming folded mountains.