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