Plate margins

Question 1

What happens at destructive margins when oceanic meets continental plate

Answer 1

Oceanic plate is denser so slides beneath continental into mantle and melts.

Question 2

What vis formed at destructive margins when oceanic meets continental plate

Answer 2

Form deep ocean trenches where plate starts to sink. Fold mountains form due to folding of continental plate. Friction causes earthquakes in area called benioff zone. Eruptions also happen as magma bubbles up

Question 3

What happens at a destructive plate boundary where oceanic plate meets oceanic plate

Answer 3

The denser oceanic is subducted beneath the other

Question 4

What is formed at a destructive plate boundary where oceanic plate meets oceanic plate

Answer 4

Ocean trenches, underwater volcanoes (due to subducted plate melting and rising up) Island arcs

Question 5

how are island arcs formed

Answer 5

Island arcs (growing volcanoes rise above sea levels to form an island volcano found in curved lines)

Question 6

What happens at a destructive plate margin with two continental plates

Answer 6

collision margin occurs as both have same density, neither plate is subducted instead they collide and crumple up to form fold mountains

Question 7

What happens at a constructive plate margins (divergent boundaries)

Answer 7

Two plate boundaries move apart, forming a new crust

Question 8

What forms at constructive plate margins

Answer 8

Mid ocean ridges, rift valleys

Question 9

How do mid ocean ridges form

Answer 9

new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt which harden and form ridge

Question 10

How do transform faults form

Answer 10

two plates slide past each other forming major break called a fault, on large scale is transform fault

Question 11

Where do rift valleys form and what boundary

Answer 11

Constructive plate margins, plates move apart crust stretches and breaks into sets of parallel cracks (faults) the land between faults then collapses forming steep sided rift valley

Question 12

How do hotspot volcanos form

Answer 12

heat rises as hot plumes of magma,
High heat and low pressure at base of lithosphere melts the rock, magma rises upwards through cracks and erupts to form active volcanos on earths surface, when plate moves over a hotspot, volcano carried away and new ones form

Question 13

What are intraplate earthquakes

Answer 13

earthquakes that occur in the middle of plate, sometimes associated with pre-existing weaknesses that become reactivated