Reddishness is due to iron content in the rock, simply the ferrous oxides.. mostly found on earth
1 is physical. Physical weathering is caused by the effects of changing temperature on rocks, causing the rock to break apart. The process is sometimes assisted by water. There are two main types which are freeze thawing and exfoliation. Physical weathering usually occurs in places where there is little soil and few plants growing like mountains, hot deserts, or tundras(the cold tundras).
Australia and Antarctica are the two countinent completely surrounded by water.
