Describe the three types of plate boundary

The three main types are; constructive (divergent), destructive (convergent) and conservative. The most straightforward one is conservative, which is where two plate boundaries slide against each other in opposite directions, causing no mass to be created or destroyed. This movement causes an earthquake. An example of this is the San Andreas fault in California. A second type is a constructive boundary, which is where new plate mass is created due to the pulling apart of the plates, allowing magma to rise up into the gap created. This magma can erupt from the crust through volcanoes. A well known constructive boundary is the Mid-Atlantic Ridge which runs through Iceland, and is Earth's longest mountain range. The final type is a destructive boundary, where plate mass is destroyed due to two plates coming together and converging. More often than not earthquakes occur at these boundaries, and the type of feature formed is dependent on the types of plates converging, for example, two continental crusts coming together causes fold mountains to form as the excess plate is forced upwards, for example, the Himalayas.