Introduction to Physical Geology（普通地质学-高清版）

magine walking on a rocky shore.You can see the
pounding surf, hear stones clink together as waves recede,
feel the wind blowing in your hair. But the cliffs don’t
move and the ground doesn’t shake. Even though the Earth
appears to be a firm foundation beneath your feet, it is a
dynamic planet. Continents slowly shift position;mountains
rise and then erode away. These motions escape casual observation
because they are generally slow, although every
year events such as volcanic eruptions and earthquakes remind
us that geologic change can be rapid.

zengzhi12345

挺好的

zhj_0074

有点太贵了

pbeideshenxin

taiguile...