Worksheets7.1.2.2 Development of a Theory
Total questions: 19
Worksheet time: 10mins
What device did scientists use to measure the depths of the ocean floor?
Echo sounder
Radar
Sonar
Seismograph
What are the underwater mountain ranges in the middle of the oceans called?
Mid-ocean ridges
Ocean trenches
Volcanic chains
Seafloor mountains
What is the deepest landform on Earth?
Mariana Trench
Mount Everest
Empire State Building
Mid-ocean ridge
What is an isochron?
An imaginary line on a map showing points of equal age
A type of volcanic rock
A deep underwater trough
A device used to measure ocean depths
What process explains the formation and destruction of oceanic crust?
Seafloor spreading
Continental drift
Volcanic activity
Tectonic plate collision
What is the layer of Earth below the lithosphere called?
Asthenosphere
Mantle
Crust
Core
What is the theory that states Earth's surface is made of rigid plates that move with respect to each other?
Plate tectonics
Continental drift
Seafloor spreading
Mantle convection
What is the largest tectonic plate on Earth?
Pacific Plate
North American Plate
Eurasian Plate
African Plate
How much do tectonic plates move per year?
1-9 cm
10-20 cm
21-30 cm
31-40 cm
What is the layer of Earth that behaves like a plastic material due to its high temperature?
Asthenosphere
Lithosphere
Mantle
Crust
What type of rock forms when lava cools and crystallizes on the seafloor?
Oceanic crust
Granite
Basalt
Sedimentary rock
What explains why the seafloor ages as you move further away from mid-ocean ridges?
Seafloor spreading
Continental drift
Volcanic activity
Tectonic plate collision
How do continents move according to the theory of plate tectonics?
As the seafloor spreads along a mid-ocean ridge
Through the solid mantle
By volcanic eruptions
By earthquakes
What are Earth's tectonic plates made of?
Rigid slabs of rock
Liquid magma
Gas and dust
Water and ice
The part of Earth made of molten rock:
lithosphere
core
asthenosphere
mantle
Created in the mantle when less dense materials rise:
subduction
convection
slab-pull
ridge-push
How do scientists measure the movement of the continents?
rulers
satellites
sonar on boats
string
How far do most tectonic plates move each year?
a few millimeters
a few centimeters
a few feet
a few miles
Floats on the asthenosphere:
lithosphere
mantle
crust
ocean
