Composition:

* Continental Rock: Predominantly composed of felsic rocks like granite, which are rich in silica, aluminum, potassium, and sodium. They are lighter in color and density.

* Seafloor Rock: Made up of mafic rocks like basalt and gabbro, which are rich in iron, magnesium, and calcium. They are darker in color and denser.

Age:

* Continental Rock: Much older, with some rocks exceeding 4 billion years old.

* Seafloor Rock: Relatively young, typically less than 200 million years old. This is due to the process of seafloor spreading, where new oceanic crust is constantly being generated at mid-ocean ridges.

Thickness:

* Continental Rock: Thicker, with an average thickness of 35 km.

* Seafloor Rock: Thinner, with an average thickness of 7 km.

Structure:

* Continental Rock: More complex, with a variety of geological structures like mountains, valleys, and plateaus.

* Seafloor Rock: Simpler, with a relatively flat, smooth structure except for mid-ocean ridges and trenches.

Density:

* Continental Rock: Less dense than seafloor rock.

* Seafloor Rock: Denser than continental rock.

Origin:

* Continental Rock: Formed from various processes, including volcanic eruptions, tectonic collisions, and erosion.

* Seafloor Rock: Formed from magma rising from the Earth's mantle at mid-ocean ridges.

Mineral Content:

* Continental Rock: Contains various minerals including quartz, feldspar, mica, and hornblende.

* Seafloor Rock: Contains minerals like pyroxene, olivine, plagioclase, and amphibole.

Here's a table summarizing the key differences:

| Feature | Continental Rock | Seafloor Rock |

|---|---|---|

| Composition | Felsic (granite) | Mafic (basalt, gabbro) |

| Age | Very old (billions of years) | Relatively young (less than 200 million years) |

| Thickness | Thick (35 km) | Thin (7 km) |

| Structure | Complex | Relatively simple |

| Density | Less dense | Denser |

| Origin | Various processes | Magma from mantle at mid-ocean ridges |

These differences in composition, age, and formation processes lead to the contrasting landscapes and geological features we observe on Earth.