A rift valley is a linear-shaped lowland between highlands or mountain ranges created by the action of a geologic rift or fault, which is subsequently further deepened by the forces of erosion. In this context, which of the following statements is/are true?

1. World's largest fresh water lakes are typically rift valleys.
2. The most extensive rift valley is located along the crest of the mid-ocean ridge system and is the result of sea floor spreading.

A rift valley is linear-shaped lowland between highlands or mountain ranges created by the action of a geologic rift or fault. This action is manifest as crustal extension, a spreading apart of the surface which is subsequently further deepened by the forces of erosion. When the tensional forces are strong enough to cause the plate to split apart, it will do so such that a center block will drop down relative to its flanking blocks. The largest freshwater lakes in the world are all located in rift valleys. The most extensive rift valley is located along the crest of the mid-ocean ridge system and is the result of sea floor spreading. Examples of this type of rift include the Mid-Atlantic Ridge and the East Pacific Rise.