A fold
The area in a fold where the limbs meet at the bend in the rock layer is called the "hinge." This central part of the fold is characterized by the maximum curvature and is where the layers of rock are most tightly compressed. The limbs of the fold extend outward from the hinge, representing the less curved portions of the rock layers.
Fols
This layer of solid rock is called bedrock.
The bottom layer of a sedimentary rock is called the basal layer. This layer is considered the coarsest in the rock.
The bottom layer of rock in a geologic sequence is usually called the basement layer.
The soil layer of rock beneath the soil is called bedrock. It is the solid rock layer that underlies the loose topsoil and subsoil layers.
== == This layer is called bedrock.
The hardened layer of lava is called "igneous rock".
Fold
Rock layers that bend and buckle are called folds. Folds are caused by tectonic forces that apply pressure to the rocks, resulting in deformation.
The outer layer of an object refers to the layer on the outside that is in place to protect it. Without an outside layer an object of the Earth could be tarnished.
The layer of solid rock below the soil is called bedrock. It is composed of consolidated rock that serves as the foundation for the soil layer above it.