Here's a breakdown:

* Vertical Distance: It's the height difference between the point in question and the reference level.

* Reference Level: Sea level is the standard reference level for elevation, though other reference levels can be used depending on the context. For example, in some cases, the elevation might be referenced to a specific datum, such as a local benchmark.

Key points to remember about elevation in geology:

* Elevation is a key factor in understanding the Earth's topography. It helps us visualize the landscape's shape, the distribution of mountains and valleys, and the flow of water.

* Elevation plays a crucial role in various geological processes. For example, elevation influences the amount of rainfall, the intensity of erosion, and the formation of different types of rocks.

* Elevation data is collected using various methods. These include surveying, GPS, and remote sensing techniques like satellite imagery.

Beyond the basics, elevation can also refer to:

* Relative Elevation: The difference in elevation between two points.

* Absolute Elevation: The elevation of a point relative to a specific datum (like sea level).

* Topographic Relief: The difference in elevation between the highest and lowest points in a given area.

Understanding the concept of elevation is crucial for various fields, including geology, geography, environmental science, and even civil engineering.