Oceangraphy Chp 1-Intro to Planet Earth

the 4 principal ocean basins on Earth are...

Atlantic, Pacific, Indian, Southern, and Arctic Oceans

based on physical properties, Earth consist of ___ layers

5

oceanic crust is predominantly composed of igneous rock called ___

basalt

One of the reasons that free oxygen in our atmosphere is important to the development and maintenance of life on Earth is because oxygen __

can form ozone and block some UV radiation

although Earth's oceans have existed since early in the formation of the planet, its __ must have changed

chemical composition

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

outer core

earth's liquid iron-nickel layer

Asthenosphere

earth's plastic layer which flows when a gradual force is applied to it

Lithosphere

earth's rigid layer that includes the crust plus the topmost portion of the mantle

Mesosphere

earth's rigid layer that includes the middle and lower mantle

inner core

earth's solid iron-nickel layer

continental crust is predominantly composed of the igneous rock called __

granite

the most likely place for the basic building blocks for the development of life to interact and produce life is in Earth's __

oceans

mantle

represents earth's high-density mostly iron-silicate layer

crust

represents earth's low-density mostly silicate layer

Current scientific knowledge indicates that the most likely origin of most of Earth's oceans was due to ...

water vapor released from volcanic outgassing

based on chemical composition, Earth consist of ___ layers

3