Plate Tectonics

Froggy Jumps

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Explore how the sea floor is explored.

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Rachael

United States

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Plate Tectonics


Froggy Jumps Plate TectonicsOnline version Explore how the sea floor is explored. by Rachael 1 What device did scientists use to map the depth of the ocean floor? a radar b sonar c telescope 2 The underwater mountain ranges in the ocean are called what? a abyssal plains b sea trenches c mid-ocean ridges 3 Which method confirmed the existence of underwater mountain ranges? a magnetic anomaly mapping b echo-sounder research c satellite altimetry 4 Compared to land mountains, sea-mounted ranges are usually what? a taller b shorter c longer 5 What feature of the ocean floor is formed by new crust at mid-ocean ridges? a seafloor spreading b subduction c erosion 6 What type of rock rises from the mantle to form new crust at ridges? a igneous glass b granite c molten rock or magma 7 What forms when molten rock cracks and erupts from volcanic vents along ridges? a crust formation b sediment deposition c coral growth 8 What cools and becomes the rock that forms ocean crust? a the water b magma c basalt 9 What happens to new ocean crust as it moves away from a ridge? a crust sinks into the mantle b crust dissolves in water c crust ages as it moves away from the ridge 10 What finally forms along a mid-ocean ridge when magma erupts? a mountain tops grow b new oceanic crust c tectonic plates fuse 11 Which landform includes the abyssal plain and rugged mountains? a the seabed plains b the atmosphere c seafloor or ocean floor 12 Rugged oceans’ mountains can form in different ways, one involves large eruptions of what? a sand b lava c ice 13 What pushes on the crust above as it cools, causing jagged mountains on the seafloor? a subduction b tidal forces c upward-moving magma 14 What eventually forms on top of the oldest oceanic crust, smoothing the seafloor? a volcanic core b abyssal plain c coral reef 15 What helps explain continental drift in Seafloor spreading? a tidal waves b air currents c oceanic crust movement away from mid-ocean ridges 16 What term describes the plain, flat deep region of the ocean floor? a mid-ocean ridge b continental shelf c abyssal plain 17 Which process leads to the creation of new crust at ridges? a seafloor spreading b subduction c erosion 18 Which feature is NOT part of the ocean floor topography? a abyssal plains b rugged underwater mountains c shelves of ice 19 What tool records depth by sending sound waves and listening for echoes? a echo-sounder b pressure gauge c sonic boom device 20 What is the term for the underwater ridge system where new crust forms? a mid-ocean ridge b trench system c fracture zone 21 Which phenomenon shows that continents drift apart over time? a tidal locking b solar heating c seafloor spreading 22 Why does the seafloor spread from the ridges outward? a to replace crust as it moves b to melt back into mantle c to rise above sea level 23 What happens to old crust at subduction zones? a it hardens into diamonds b it sinks back into the mantle c it becomes crustless 24 Evidence to support seafloor spreading first came from studying the ______ of rocks on the seafloor. a age b composition c density 25 Earth's outer core causes Earth's ______. a magnetic field b electric field c gravity 26 The direction of Earth's magnetic field ______ often. a increases steadily b changes or reverses c remains fixed 27 When a magnetic field causes a magnet to point north, the magnetic field has ______. a magnitude b orientation c normal polarity 28 After a magnetic reversal, a magnet points south because Earth's magnetic field has ______. a weaker strength b fluctuated intensity c reversed polarity 29 _______ form when iron-rich minerals in cooling lava align with Earth's magnetic field. a Igneous rocks b Sedimentary layers c Magnetic minerals 30 The direction of a magnetic field in minerals can be determined by using a device called a(n) ______. a thermometer b seismograph c a(n) magnetometer 31 Magnetometers show ______ magnetic stripes on either side of a mid-ocean ridge. a parallel b diagonal c perpendicular 32 These stripes alternate normal polarity and ______, showing that each stripe was formed at the mid-ocean ridge. a reversed polarity b weaker field c increased intensity 33 Sediment collected from the seafloor shows that sediment farther away from a mid-ocean ridge is ______ than the sediment closer to the ridge. a younger b the same age c older 34 A mid-ocean ridge is a ______ where new oceanic crust is formed. a divergent plate boundary b transform boundary c convergent boundary 35 The age of rocks on the seafloor generally becomes ______ as you move away from the ridge. a the same age b younger c older 36 Magnetic stripes across the ocean floor are symmetric around the ______. a mid-ocean ridge b continental shelf c polar ice cap 37 A device used to measure the strength and direction of magnetic fields is a(n) ______. a gravimeter b anemometer c magnetometer 38 When scientists plot magnetic polarity over time, they observe ______ reversals. a random b periodic c constant 39 The term for the alignment of magnetic minerals with Earth’s field is called magnetic ______. a striping b locking c tilt 40 Iron-rich minerals that are magnetic are found in ____________. a rock-forming b silicate c basalt 41 The pattern of magnetic stripes provides a record of seafloor ______. a spreading b subduction c subduction zones 42 Magnetic reversals are recorded in rocks as ______ in the magnetic orientation of minerals. a stability b uniformity c changes 43 Seafloor spreading contributes to continental drift by pushing lithosphere ______ at ridges. a around b together c apart 44 Geomagnetic reversals are detected by studying the magnetization of ______ rocks. a sea-floor b continental c meteoric 45 Hot, molten rocks at mid-ocean ridges crystallize and align with the current magnetic ______. a field b orientation c strength

Plate Tectonics

Froggy Jumps

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What device did scientists use to map the depth of the ocean floor?

The underwater mountain ranges in the ocean are called what?

Which method confirmed the existence of underwater mountain ranges?

Compared to land mountains, sea-mounted ranges are usually what?

What feature of the ocean floor is formed by new crust at mid-ocean ridges?

What type of rock rises from the mantle to form new crust at ridges?

What forms when molten rock cracks and erupts from volcanic vents along ridges?

What cools and becomes the rock that forms ocean crust?

What happens to new ocean crust as it moves away from a ridge?

What finally forms along a mid-ocean ridge when magma erupts?

Which landform includes the abyssal plain and rugged mountains?

Rugged oceans’ mountains can form in different ways, one involves large eruptions of what?

What pushes on the crust above as it cools, causing jagged mountains on the seafloor?

What eventually forms on top of the oldest oceanic crust, smoothing the seafloor?

What helps explain continental drift in Seafloor spreading?

What term describes the plain, flat deep region of the ocean floor?

Which process leads to the creation of new crust at ridges?

Which feature is NOT part of the ocean floor topography?

What tool records depth by sending sound waves and listening for echoes?

What is the term for the underwater ridge system where new crust forms?

Which phenomenon shows that continents drift apart over time?

Why does the seafloor spread from the ridges outward?

What happens to old crust at subduction zones?

Evidence to support seafloor spreading first came from studying the ______ of rocks on the seafloor.

Earth's outer core causes Earth's ______.

The direction of Earth's magnetic field ______ often.

When a magnetic field causes a magnet to point north, the magnetic field has ______.

After a magnetic reversal, a magnet points south because Earth's magnetic field has ______.

_______ form when iron-rich minerals in cooling lava align with Earth's magnetic field.

The direction of a magnetic field in minerals can be determined by using a device called a(n) ______.

Magnetometers show ______ magnetic stripes on either side of a mid-ocean ridge.

These stripes alternate normal polarity and ______, showing that each stripe was formed at the mid-ocean ridge.

Sediment collected from the seafloor shows that sediment farther away from a mid-ocean ridge is ______ than the sediment closer to the ridge.

A mid-ocean ridge is a ______ where new oceanic crust is formed.

The age of rocks on the seafloor generally becomes ______ as you move away from the ridge.

Magnetic stripes across the ocean floor are symmetric around the ______.

A device used to measure the strength and direction of magnetic fields is a(n) ______.

When scientists plot magnetic polarity over time, they observe ______ reversals.

The term for the alignment of magnetic minerals with Earth’s field is called magnetic ______.

Iron-rich minerals that are magnetic are found in ____________.

The pattern of magnetic stripes provides a record of seafloor ______.

Magnetic reversals are recorded in rocks as ______ in the magnetic orientation of minerals.

Seafloor spreading contributes to continental drift by pushing lithosphere ______ at ridges.

Geomagnetic reversals are detected by studying the magnetization of ______ rocks.

Hot, molten rocks at mid-ocean ridges crystallize and align with the current magnetic ______.