Quiz 3

What led to the discovery of mid-ocean ridges?

Military maps of the seafloor created during World War II

Most of the water that fills Earth's oceans came from ____.

Outer region of the solar system

Techniques that do not require direct physical contact with the ocean floor, such as ship-based echo sounders or satellite-based microwave radar, are called _______________ methods.

Remote Sensing

Where two plates converge and one dives beneath the other, a(n) _______________ zone is formed.

Subduction Zone

The process where intense low pressure forming over warm oceans can create ____.

Tropical Cyclones

Oceans are commonly warmer than adjacent land in the winter and cooler in the summer.

True

Sea levels has risen and fallen repeatedly in the geologic past, and coastlines have emerged and submerged throughout Earth's history.

True

The Mid-Oceanic Ridge system is Earth's largest mountain chain.

True

The upward flow of water that carries cold water from the ocean depths to the surface is called _______________.

Upwelling

Tropical cyclones form over ____.

Warm Oceans

Monsoon

are seasonal winds caused by uneven heating and cooling of land and sea.

Tornado

are small, short-lived, funnel-shaped storms that protrude from the base of a cumulonimbus cloud.

Lightning is possibly caused by friction between intense winds and ice crystals as well as ____.

cosmic rays bombarding the tops of cloud and producing ions

Deep-sea currents are driven by ____.

differences in water density

What causes a monsoon?

uneven heating of land and air

Ocean water density depends on ____.

temperature and salinity

Oceans cover about ____ percent of Earth's surface.

71%

The Mid-Oceanic Ridge rises high above the surrounding sea floor because new lithosphere forming at the ridge axis is ____ and of relatively ____ density.

Hot and Low

Oceanic crust is mostly composed of _______________.

Basalt

How could the Mid-Ocean Ridge system have caused sea level to rise in the past?

By bringing water up from the mantle

Samples of sediment can be collected from the seafloor using ____.

Coring Devices

In an El Niño year, the trade winds will ____.

Decrease

Oceanic crust is ____ than continental crust and therefore ____ isostatically.

Denser, Sinks

Mid-Ocean Ridges are examples of _______________ plate boundaries.

Divergent

Granite is more dense than basalt.

False

Oceanic crust is thicker than continental crust.

False