Extrusive igneous rocks generally have a fine grain texture. This is because they cool quickly on the Earth's surface, causing the minerals to form small crystals.
The grain of an intrusive rock is typically coarse due to the slow cooling process underground, allowing large crystals to form. This coarse grain size is a distinguishing feature of intrusive rocks compared to extrusive rocks, which cool quickly on the Earth's surface and have fine-grained textures.
fine grained or coarse grained
extrusive
Intrusive and extrusive factors of an igneous rock classify them. The other factors are if they are vesicular, coarse, fine grained, glassy, or very coarse
To determine if a rock is extrusive or intrusive, examine its texture and grain size. Extrusive rocks, formed from lava that cools quickly on the Earth's surface, typically have a fine-grained or glassy texture with small crystals. In contrast, intrusive rocks cool slowly beneath the surface, resulting in a coarse-grained texture with larger, visible crystals. Additionally, the presence of gas bubbles in extrusive rocks can further indicate their formation from volcanic activity.
Coarse is ruff/hard, and fine grain is smooth/ soft!
fine grained
Coarse is ruff/hard, and fine grain is smooth/ soft!
The grain of an intrusive rock is typically coarse due to the slow cooling process underground, allowing large crystals to form. This coarse grain size is a distinguishing feature of intrusive rocks compared to extrusive rocks, which cool quickly on the Earth's surface and have fine-grained textures.
Extrusive igneous rocks are usually fine grained.
Fine grains are harder than coarse grains
fine grained or coarse grained
Yes extrusive rocks are fine grained because they cool down at a faster rate.
No only fine grained as they cool quickly when out of the earths mantle so no time for crystals to form.
Basalt and gabbro are both igneous rocks, with major differences in grain size and where they form. Basalt has fine-grained crystals and forms from lava flows on the Earth's surface, while gabbro has coarse-grained crystals and forms from magma cooling beneath the Earth's surface.
No, intrusive rocks are typically coarse-grained because they form from magma that cools slowly beneath the Earth's surface, allowing larger crystals to develop. In contrast, extrusive rocks, which form from lava that cools quickly on the surface, are usually fine-grained. Thus, the grain size is a key distinguishing feature between intrusive and extrusive igneous rocks.
The grain size of an extrusive igneous rock is typically fine-grained to aphanitic, meaning the individual mineral grains are not visible to the naked eye. This rapid cooling at the Earth's surface prevents large crystals from forming, resulting in a fine texture.