WorksheetsPlate Tectonics Lesson 2: Seafloor Spreading
Total questions: 12
Worksheet time: 21mins
Geologist and Navy Admiral who mapped the seafloor in WWII discovering the Mid Atlantic Ridge and ocean trenches which led to his theory of 'seafloor spreading'
Alfred Wegener
Harry Hess
Technology that Harry Hess used to map the ocean floor.
SONAR
LASER
Echo Boom
Drone
2 types of SONAR
Passive and Active
Conductor and Insulator
Round and Square
Light and Dark
In Seafloor Spreading, molten material rises from the mantle and erupts or flows out
along the edges of all the continents
in the deep ocean trenches
along mid-ocean ridges
in the north and south poles
Hot, less dense materials below the Earth's crust ______to the surface at the mid ocean ridges.
rises
falls
disappears
shrinks
Process of heated liquids or gases becoming less dense and rising.
Convection
Conduction
Radiation
Emitting
Earth magnetic field is know to ________ over time
flip
stay the same
be steady
get stronger
Iron minerals from the mid ocean ridge track to direction of the Earths magnetic poles. This created a record of seafloor spreading.
True
False
