Concept:Mechanical weathering breaks rocks along natural cracks called joints, producing angular blocks.
Explanation:Well jointed rocks contain parallel vertical and horizontal cracks.
Weathering agents such as water and temperature changes attack these joint planes.
The rock is gradually broken into large rectangular-shaped blocks.
This process is known as block disintegration.
Exfoliation dome refers to the peeling away of curved rock sheets.
Landslide is a rapid downhill movement of rock and soil.
Solifluction is the slow flow of waterlogged soil over frozen ground.
Answer:A. block disintegration