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.
This creates a volcano. When the magma cools it turns into solid rock, called extrusive igneous rock. Magma that cools underground forms solid rock called intrusive igneous rock. Areas of rock can move slowly upwards, pushed up by pressure of the rocks forming underneath. This is called uplift.Weathering breaks down rocks on the surface of the Earth.agma that cools underground forms solid rock called intrusive igneous rock. Areas of rock can move slowly upwards, pushed up by pressure of the rocks forming underneath. This is called uplift. Weathering breaks down rocks on the surface of the Earth.