Oceanography Ch.1

A tentative, testable statement about the general nature of a phenomenon is called a/an:

hypothesis

the continental crust is usually ____ and ____ compared to the oceanic crust

less dense and thicker

evidence suggests that the sun and the rest of the solar system formed about 5 _____ years ago

billion

which of the following is not a characteristic of the sea

composed of freah water

The separation of the Earth into layers while it was molten was the result of the:

differing densities of the elements that make up the Earth.

which is not a chemical layer of the earth

lithosphere

Isotatic adjustments are the result of buoyancy of earths lithosphere as it floats on the _____ below which is denser and plastic like

asthenosphere

the four principal ocean basins (plus the additional ocean) on earth are the

atlantic, pacific, indian, southern, and arctic oceans

earths crust is composed of the rocks: ____ and ____

basalt and iron

current scientific knowledge indicates that the most likely origin of the earths ocean was due to the

water vapor released from volcanic outgassing

the average depth of the worlds ocean is approximately

3628 meters (12,080 feet)

earth is about ____

4.6 billion years old

Which ocean covers more than half of the ocean surface area on Earth?

Pacific Ocean

which ocean is actually part of three other oceans

the southern ocean

based on the chemical composition Earth consist of _____ layers

3

what is the approximate percentage of water on earth surface

70%

which planetary body is water is not suspected to be on

europa

the sun and the rest of the solar system formed about 5 billion years ago from a huge cloud of dust and gas called a

nebula

Which layer of Earth is liquid?

outer core

how did scientist determine the composition of earths interior

seismic waves