texture
Its texture.
the look and feel of sedimentary rocks are sometimes hard and smooth or hard and rough
General physical appearance.
Rocks that feel and look the same likely share similar mineral composition and texture. Minerals present in the rock, as well as the way the rock formed (igneous, sedimentary, metamorphic), contribute to its appearance and feel. Thus, rocks that appear and feel the same are likely to be composed of similar minerals and have undergone similar geological processes.
Look at them. There shape, size, color and feel! Dont worry you will figure it out....
igneous rocks that form on earth's surface
actual texture are the feel and look of a surface be it rough or smooth and seen as such
Sedimentary rocks form on the Earth's crust, and can form metamorphic rocks when buried. Igneous rocks form under the surface, or when liquid magma reaches the surface as lava.
In my opinion for the fishes feel more in their real habitat and look good in a aquarium!
Lava.
Magma is under the surface of Earth's crust. Rocks on earth's surface are well ... on Earth's surface. Magma is also molten rock, not solid rock like the rocks on earth's surface.
Reverse Fault