Which is the last stage of physical weathering in rocks?
A. sand
B. rock
C. boulder
D. pebble
C. boulder
The last stage of physical weathering in rocks is option D. pebble.
The last stage of physical weathering in rocks is the formation of smaller fragments called pebbles.
To arrive at this answer, it is helpful to understand the process of physical weathering in rocks. Physical weathering involves the physical breakdown of rocks into smaller pieces without any change in their chemical composition. This process occurs due to various factors like temperature changes, freeze-thaw cycles, abrasion from wind or water, and the growth of plant roots.
As rocks undergo physical weathering, they progressively break down into smaller fragments. The initial stage of physical weathering is the formation of larger fragments called boulders, followed by the formation of smaller pieces called rocks. Finally, the last stage is the formation of even smaller fragments known as pebbles.
Therefore, the correct answer is D. pebble.