Plate tectonic

When did the idea of Earth's continents drifting around the globe become widely accepted by most geologists?

• Before the 1800s

• In the early 1900s

• In the 1960s

• After the year 2000

What is the common simplified explanation for why tectonic plates move?

• They are pushed by volcanic eruptions.

• They are carried along on currents in the upper mantle.

• They slide due to gravitational forces from the moon.

• They are pulled by the Earth's magnetic field.

Why is the simplified explanation of tectonic plates being passively carried by mantle currents not entirely accurate?

• Mantle currents are too slow to move plates.

• Some plates move faster than the currents underneath them.

• Plates are fixed and do not move at all.

• The mantle is solid and cannot have currents.

What happens at divergent boundaries between tectonic plates?

• Plates slide past each other

• Plates slide past each other

• Plates collide and form mountains

• Plates remain still

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What type of geological feature can form when two continental plates collide?

• Ocean trenches

• Mid-ocean ridges

• Mountain ranges

• Volcanoes under water

What happens when a thinner ocean plate collides with another plate, causing it to bend and slide underneath?

• It creates new continental crust.

• It causes the plate to stop moving.

• It pulls the plate behind it further into the mantle.

• It forms a new mid-ocean ridge.

Besides mantle convection, what are the other significant forces that contribute to the movement of tectonic plates?

• Wind and ocean currents.

• Gravitational pull from the sun.

• Slab pull and slab suction.

• Volcanic eruptions and earthquakes.

Which of the following best describes the role of convection currents in plate tectonics?

• They break the plates into pieces

• They carry plates like a conveyor belt

• They prevent plates from moving

• They cool the Earth's core