yes, it does. when a grain size in an igneous rock is small, it means that it was probably an extrusive rock, meaning it formed on land. but if the grain size is big, it means that the rock most likely formed underground, or it was intrusive. try remembering it like this- the larger the crystals, the more time the rock had to form, and magma cools faster on land, not giving the rocks much time to form.
Obsidian
Neither. Conglomerate is a sedimentary rock. Intrusive and extrusive are descriptive terms used to classify igneous rocks.
Sedimentary Rocks. 75% of rocks exposed to the surface are sedimentary.
Sedimentary, Igneous and Metamorphic.
== == Extrusive igneous rocks are formed from the solidification of lava on or above the surface. Rapid cooling from exposure to air or water results in rapid crystallization of their component minerals, normally creating a fine grained texture as opposed to intrusive igneous rocks which have a coarser texture. Examples of extrusive igneous rocks would include obsidian, pumice, basalt, and rhyolite.
Extrusive igneous rocks are usually fine grained.
The most useful property for identifying igneous rocks is their mineral composition, particularly the presence and abundance of specific minerals such as quartz, feldspar, and mica. Additionally, texture—such as grain size and the presence of crystals—can provide insight into the rock's cooling history and origin. Color can also be an indicator, as it often relates to the mineral content. These characteristics together help in distinguishing between different types of igneous rocks, such as basalt and granite.
Sedimentary rocks and igneous rocks can be broken down into smaller groups based on grain size. In sedimentary rocks, grain size categories include clay, silt, sand, and gravel. In igneous rocks, grain size categories include fine-grained, medium-grained, and coarse-grained.
== Grain size. Most intrusive igneous rocks will have visible crystals. Crystals in most extrusive igneous rocks are not easily visible.
yellow green and red
Igneous rocks are classified by either being intrusive or extrusive, then mafic or felsic then they are classified by either fine grain or course grained textures.
Rocks are defined by their mineral composition, texture, and formation processes. They can be classified into three main types: igneous, sedimentary, and metamorphic, each with distinct characteristics. Igneous rocks form from cooled magma or lava, sedimentary rocks consist of accumulated sediments and organic materials, and metamorphic rocks arise from the alteration of existing rocks under heat and pressure. Additional characteristics include color, hardness, and grain size, which help in identifying and classifying rocks.
Hardness of rock (by using mohr's scale)
Rocks can be classified based on their texture, color, mineral composition, and how they formed. Identifying features like grain size, layering, and crystal shape can help distinguish between different types of rocks such as sedimentary, igneous, and metamorphic. In addition, conducting simple tests like scratching with a nail or testing for fizzing with acid can further assist in identifying rock types.
igneous rocks
Igneous rocks have a wide range of strengths depending on factors like mineral composition and cooling history. Some igneous rocks, like granite, can be very strong and durable, while others, like pumice, can be quite weak and easily crumble.
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.