Answer:
front develop the bundarey where two air masses with different temperature
Answer: The Earth is a closed system for matter
That is a list of all basic elemental materials on our planet. Because of gravity, matter (comprising all solids, liquids and gases) does not leave the system.
I agree with the answer above - boreal forests are the kind of forests that remain green all year, because evergreen trees can be found there. Opposite of this, temperate forests do not stay green all year, because they have deciduous trees, which means their leaves fall off.
They are the last ones to die or get extinct
