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).
Weathering and erosion. Weathering is the process where rock is dissolved, worn away or broken down into smaller and smaller pieces. There are mechanical, chemical and organic weathering processes. Organic weathering happens when plants break up rocks with their growing roots or plant acids help dissolve rock.
When water enters cracks in rocks and freezes, expanding and breaking the rock apart, it is called _______. ice wedging. In another type of mechanical weathering, plant ______1_______ seeking water and nutrients sometimes grow into ______2_____ in the rock and break the rock apart. 1. roots. 2. cracks.