Composition:
* Oceanic crust: Predominantly composed of basalt and gabbro, dark-colored, dense igneous rocks rich in magnesium and iron.
* Continental crust: Primarily made up of granite and andesite, lighter-colored, less dense igneous rocks with higher silica content.
Thickness:
* Oceanic crust: Relatively thin, ranging from 5 to 10 kilometers thick.
* Continental crust: Significantly thicker, averaging 35 kilometers but reaching depths of 70 kilometers in mountainous regions.
Density:
* Oceanic crust: Denser than continental crust due to its higher iron and magnesium content. This makes it sink beneath continental crust at subduction zones.
* Continental crust: Less dense, which allows it to "float" higher on the mantle.
Age:
* Oceanic crust: Constantly being created at mid-ocean ridges and recycled back into the mantle through subduction. The oldest oceanic crust is about 200 million years old.
* Continental crust: Much older, with some continental rocks dating back billions of years.
Features:
* Oceanic crust: Characterized by features like mid-ocean ridges, trenches, and volcanic islands.
* Continental crust: Marked by mountain ranges, plateaus, and sedimentary basins.
Here's a simple analogy: Imagine oceanic crust like a thin, dark pancake and continental crust like a thick, fluffy pancake. The oceanic pancake is denser and sinks beneath the continental pancake at their point of contact.
Here's a table summarizing the differences:
| Feature | Oceanic Crust | Continental Crust |
|-----------------|---------------|--------------------|
| Composition | Basalt, Gabbro | Granite, Andesite |
| Thickness | 5-10 km | 35 km (average) |
| Density | Denser | Less dense |
| Age | Younger | Older |
| Features | Mid-ocean ridges, trenches, volcanic islands | Mountain ranges, plateaus, sedimentary basins |
