Define mechanical weathering using your own words

Mechanical weathering is the process of breaking big rocks into little rocks 

As defined below.

Explanation:

The mechanical weathering also called the physical weathering is the process of the disintegration of the rock mass by geographic tools that impacts the geologic structure of the rocks, and hence cause rapid changes s in the composition of the rocks and can also lead to landslides and mass wasting phenomenon.  The natural mechanical weathering involves the use of the various agent slike the winds, ice, and moving water, etc. Breaking The ricks to form various minerals and then releasing them into the soil and hence are associated with the soil-forming process.

Answer// dinosaurs emerged during mesozoic era;