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.
Answer: The breaking down of rocks without changing their chemical makeup. Explanation: There are two types of weathering: Physical Weathering (also called Mechanical Weathering) is caused by things like wind or water. These break down the rock without changing its chemical structure. With physical weathering, rocks tend to crumble as they erode. Chemical Weathering is caused by acids and dissolves rocks.