name a rock that is both felsic and intrusive.
mane a rock that has high dinsity and a course grained texture.
A rock that is both felsic and intrusive is granite. To understand how we arrived at this answer, let me explain the terms involved.
"Felsic" refers to the composition of a rock, specifically high in silica and lighter-colored minerals like quartz and feldspar. Felsic rocks are usually associated with continental crust.
"Intrusive" describes the formation of a rock when magma solidifies beneath the Earth's crust. Intrusive rocks have a coarse-grained texture due to slower cooling rates, allowing larger mineral grains to develop.
Now, when we combine these two terms, we find that granite fits the description. Granite is a felsic rock as it contains a high proportion of light-colored minerals like quartz and feldspar. It is also intrusive because it forms beneath the Earth's surface. Additionally, granite is well-known for its coarse-grained texture, with visible minerals such as quartz, feldspar, and mica.
Moving on to the second part of your question, a rock that has high density and a coarse-grained texture is basalt. Let's delve into the reasoning behind this.
High density is typically associated with rocks that have a greater abundance of heavy minerals. Basalt is composed mainly of minerals such as pyroxene and olivine, which are denser than most minerals found in the Earth's crust.
Regarding texture, basalt is known for its fine-grained or sometimes even glassy texture. However, there is a type of basalt called "coarse-grained" basalt, which is characterized by larger mineral grains. This coarse-grained variety of basalt forms when the magma cools more slowly, allowing the crystals to grow to a larger size.
So, in summary, a rock with high density and coarse-grained texture is basalt, while a rock that is both felsic and intrusive is granite.