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.
Mechanical weathering is a process where big rocks are broken down to smaller fragments due to physical forces acting on them. Read more about what causes mechanical weathering by going through the following article.echanical weathering involves physical activities leading to break down of rocks and chemical weathering involves natural chemical reactions leading to decomposition of the rocks.