Planet Earth Exam 1 Chapter 2

Which of the following is NOT true about a hot spot? A) Hot spot plumes originate from the core-mantle boundary B) The Hawaiian Islands are being formed by a hot spot C) Hot spots are primarily located near plate boundaries D) Hot spots are thought to be stationary plumes of hot mantle rock which move towards the surface.

C) Hot spots are primarily located near plate boundaries

Tectonic plates are part of the ____________ and float on the _____________ . A) Mantle ; Outer Core B) Lithosphere ; Hydrosphere C) Lithosphere ; Asthenosphere D) Asthenosphere ; Lower Mantle E) Mantle ; Crust

C) Lithosphere ; Asthenosphere

Magnetic minerals within rock which have an inclination of 90 degrees (are perpendicular to the surface) indicate that the rock formed ____________ . A) At the equator B) Underwater and opposed to land C) At the geographic pole D) At the magnetic pole

D) At the magnetic pole

Approximately how fast do tectonic plates move? A) 1-15 km/yr B) 1-15 cm/yr C) 1-15 km/million years D) 1-15 m/yr E) 1-15 mm/yr

B) 1-15 cm/yr

Oceanic crust is primarily composed of __________ while continental crust is composed of ____________. A) granite ; basalt B) basalt ; granite C) barite ; greenstone D) limestone ; granite E) gabbro ; sandstone

B) basalt ; granite

Oceanic crust is formed at __________ boundaries and destroyed at ___________ boundaries. A) divergent ; transform B) divergent ; convergent C) convergent ; divergent D) transform ; convergent

B) divergent ; convergent

Why isn't there much ocean crust older than 180 million years old? A) Over time the oceanic crust turns into continental crust B) The sediments on top of the ocean crust give ages of 180 million years old but the actual ocean crust is much older C) Ocean crust only started to form for the first time a little over 180 million years ago D) Old ocean crust becomes cold and dense and eventually subducts back into the mantle

D) Old ocean crust becomes cold and dense and eventually subducts back into the mantle

Select all of the following which can make the following statement true: The oceanic crust ___________________ than the continental crust. A) is thicker B) sits high in the mantle C) is less dense D) is rougher E) sits lower in the mantle F) is thinner G) is more dense

E) sits lower in the mantle F) is thinner G) is more dense

What causes tectonics plates to move? A) Convection in the Mantle B) Earth's Rotation C) The Wind D) Isostatic Forces E) Tidal forces from the Moon

A) Convection in the Mantle

Why was Alfred Wegner's Theory of continental drift not accepted? A) He could not explain what caused the continents to move. B) He forgot to take into account Earth's gravity and rotation. C) His mathematical calculations of plate motions were off D) the apparent fit of continental coastlines is blurred when the margins are defined by the edges of continental shelves rather than sea level E) He could not explain when and how the first continents were first created

A) He could not explain what caused the continents to move.

Paleomagnetic stripes on the ocean floor run parallel to _____________ A) Mid Ocean Ridges B) Subduction Zones C) Transform Boundaries D) Geographic North E) Mountain Belts

A) Mid Ocean Ridges

Which of the following did Alfred Wegner NOT use as evidence for his theory of continental drift? A) Paleomagnetic stripes on the ocean floor B) Paleoclimate Data C) Glacial Deposits D) Fossils from land animals E) Matching rock units

A) Paleomagnetic stripes on the ocean floor

The Himilayan Mountains has what type of plate boundary?

Convergent Boundary

Mid Ocean Ridge has what type of plate boundary?

Divergent Boundary

Sea Floor Spreading has what type of plate boundary?

Divergent Boundary

The Red Sea has what type of plate boundary?

Divergent Boundary

What kind of motion does Divergent Boundary have?

Plates Spreading Apart

What kind of motion does Convergent Boundary have?

Plates moving together and colliding

What kind of motion does Transform Boundary have?

Plates sliding next to each other side by side

Accretionary Prism has what type of plate boundary?

Sudbuction Zone (convergent)

Trench has what type of plate boundary?

Sudbuction Zone (convergent)

Volcanic Arcs have what type of plate boundary?

Sudbuction Zone (convergent)

The San Andreas Fault has what type of plate boundary?

Transform Boundary