L1 : ORIGIN AND STRUCTURE OF THE EARTH Flashcards
is remarkably special and unique and is the only place in the known universe confirmed to host life
EARTH
why planet earth is a unique one? (1/3)
(1) it has liquid water
why planet earth is a unique one? (2/3)
(2) plate tectonics
why planet earth is a unique one? (3/3)
(3) it has atmosphere that shelters it from the worst of the sun’s rays.
how many percent of the earth surface is covered by liquid or frozen water?
about 70%
earth is sometimes called as?
blue planet
“the most impressive attribute of the earth is the existence and amount of liquid water on its surface,” is said by whom?
geoffrey marcy
planet earth is considered habitable because of the following reasons: (1/1)
(1) it has the right distance from the sun;
planet earth is considered habitable because of the following reasons: (2/2)
(2) it is protected from harmful solar radiation by its magnetic field;
planet earth is considered habitable because of the following reasons: (3/3)
(3) it is kept warm by an insulating atmosphere; and
planet earth is considered habitable because of the following reasons: (4/4)
(4) it has the right amount of ingredients for life, including water and carbon.
what are the 4 factors that make a planet habitable
temperature, atmosphere, energy, and nutrients
life seems to be limited to a temperature range of -15 0C to 115 0C. In this range, liquid water can still exist under certain condition
temperature
in what temperature range life seems to be limited?
-15 0C to 115 0C
it keeps the surface warm and protects it from radiation and small- to medium- sized meteorites.
atmosphere
