Plate Tectonics Theory

Question 1

The central or inner part of the Earth (inner and outer core)

Answer 1

Centrosphere

Question 2

also known as the mantle, it lies just below the earth’s crust

Answer 2

Mesosphere

Question 3

the ductile part of the earth just below the lithosphere, including the upper mantle

Answer 3

Asthenosphere

Question 4

the outer solid part of the earth, including the crust and uppermost mantle

Answer 4

Lithosphere

Question 5

Features of the Plates

Answer 5

● A plate is a part of the lithosphere, which includes the uppermost part of the mantle and the crust above it.

● One plate can carry both oceanic and continental crusts. Continental crust-125 km; Oceanic crust -75 km

● A plate is composed of a hard, mechanically strong rock

● A plate floats on the hot plastic asthenosphere and glides horizontally over it.

● Each plate moves as a large intact sheet of rock.

● Earthquakes and volcanoes are common along plate boundaries.

● Tectonic plates move at a very slow rate. They glide over the asthenosphere at a rate of about 1 to 16 cm a year.

Question 6

proposes that there was once a giant continent. This supercontinent (Pangaea) broke into several pieces that slowly drifted away from one another.

Answer 6

Continental Drift Theory (1912)

Question 7

hypothesizes that magma from the mantle oozes out to the crust and pushes fragment of the crust away from each other, thus, widening the ocean floor. The rising magma moves by convection. Heat in the earth’s interior creates convection cells within the mantle and the crust moves with the mantle like a conveyor belt system.

Answer 7

The Seafloor Spreading Theory (1960)

Question 8

The rising magma moves by ???

Heat in the earth’s interior creates convection cells within the mantle and the crust moves with the mantle like a conveyor belt system.

Answer 8

convection

Question 9

states that the earth’s lithosphere is divided into seven major plates and some
minor ones.

Answer 9

Plate Tectonics Theory (1915)

Question 10

Jason Morgan

Answer 10

Plate Tectonics Theory

Question 11

Alfred Wegener

Answer 11

Continental Drift Theory

Question 12

Harry H. Hess

Answer 12

The Seafloor Spreading Theory

Question 13

The Seven Major Plates

Answer 13

African

Antarctic

Eurasian

Indo-Australian

North-American Pacific

South-American

Question 14

The plates move smoothly across the earth at a
rate of about ? to ?? cm a year.

Answer 14

1 to 16

Question 15

The Plate Tectonics Theory may be used to explain the following

Answer 15

✔ The earth’s surface continues to change through time;

✔ Earthquakes occur in some places,

✔ Certain regions experience volcanic activities;

✔ Mountain ranges are located where they are due to geologic activities.

Question 16

a part of the lithosphere, which includes the uppermost part of the mantle and the crust above it

Answer 16

Plate

Question 17

The mechanical and compositional layers of the earth are:

Answer 17

the lithosphere

the asthenosphere

the mesosphere

the centrosphere.

Question 18

How many plate/s can carry both oceanic and continental crusts?

Answer 18

One plate

Question 19

composed of a hard, mechanically strong rock

floats on the hot plastic asthenosphere and glides horizontally over it

moves as a large intact sheet of rock

Answer 19

Plate

Question 20

Common among plate boundaries

Answer 20

Earthquakes and Volcanoes

Question 21

They move at a very slow rate.

They glide over the asthenosphere at a rate of about 1 to 16 cm a year.

Answer 21

Tectonic plates

Question 22

proposes that there was once a giant continent

Answer 22

The Continental Drift Theory

Question 23

This supercontinent broke into several pieces that slowly drifted away from one another.

Answer 23

Pangaea

Question 24

hypothesizes that magma from the mantle oozes out to the crust away from each other, thus, widening the ocean floor.

Answer 24

The Seafloor
Spreading Theory

Question 25

unifies the Continental Drift and Seafloor Spreading theories

Answer 25

The Plate Tectonic Theory

Question 26

states that the lithosphere is divided into seven large tectonic plates and some smaller ones that glide above the asthenosphere at a rate of a few centimeters per year.

Answer 26

The Plate Tectonic Theory