In English conditional sentences, the condition clause (protasis) is a dependent clause, most commonly introduced by the conjunction if. Other conjunctions or equivalent expressions may also be used, such as unless (meaning if...not), provided (that) , providing (that) and as long as.irst conditional or conditional I refers to a pattern used in predictive conditional sentences, i.e. those that concern consequences of a probable future event (see Types of conditional sentence).
Lesson Summary [edit]. 1  Mechanical weathering breaks existing rock into smaller pieces without changing the composition of the rock. 2  Ice wedging and abrasion are two important processes of mechanical weathering. 3  The main agents of mechanical weathering are moving water, wind, glacial ice and gravity.
Weathering breaks down the mountainâs surface into tiny pieces called sediment. Over time, the forces of weathering (wind, water, rain, ice, waves, chemicals, gravity, and organisms) wear down and eventually level the mountain by breaking up or dissolving its rock into smaller and smaller pieces. The next step in the process is erosion. Erosion is the carrying away, movement, or removal of weathered rock, dirt, and other bits of earth from one place to another by wind and water in various forms. One of the more forceful agents of erosion is running water, which picks up and transports weathered material.