Seafloor spreading

The youngest rocks on the ocean floor are located ____.

• near continents

• at mid-ocean ridges

• far from mid-ocean ridges

• near Asia

Tags

NGSS.MS-ESS2-3

The crust and the rigid part of the upper mantle make up Earth's ____.

• asthenosphere

• lithosphere

• core

• continents

Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____.

• century

• year

• day

• decade

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

Seafloor spreading occurs because ____.

• new material is being added to the asthenosphere

• earthquakes break apart the ocean floor

• sediments accumulate at the area of spreading

• molten material beneath Earth's crust rises to the surface forming new crust

A vast, underwater mountain chain is called a(n) _________.

• ocean ridge

• oceanic crust

• deep-sea trench

• ocean floor sediment

Tags

NGSS.MS-ESS2-3

What technology did scientists use in the 1950's to map the ocean floor and originally discover the mid-ocean ridge?

• satellites

• Magnometers

• deep-sea diving

• sonar / echo-sounding

In sea-floor spreading, molten material rises from the mantle and erupts

• in deep-ocean trenches

• along the edges of all the continents

• along mid-ocean ridges

• at the north and south plate

Tags

NGSS.MS-ESS2-3

NGSS.MS-ESS2-2

The process of ___________ continually adds new crust to the ocean floor along both sides of the mid-ocean ridge.

• plate tectonics

• seafloor spreading

• continental drift

• convection

Tags

NGSS.MS-ESS2-3

Where is the oldest oceanic-crust found?

• Further away from the mid-ocean ridge

• Close to the mid ocean ridge

• it's all the same age

• the crust move

The scientist credited with sea-floor spreading is _________

• Alfred Wegener, a German scientist

• Harry Hess, an American geologist

• J.Tuzo Wilson, a Canadian scientist

• Kenn Bulaso, a Filipino educator

Tags

NGSS.MS-ESS2-3