is an igneous rock?
according to the book Rocks and minerals (Zim 110) an
igneous rock is a rock made of magma cooling an harding. But is there
more to igneous rocks? Are there types of igneous rocks? Where and how
are igneous rocks formed and does where they form affect them? What are
some types of igneous rocks? All of these questions will
be answered on this web page.
first question, are
there more types of igneous rocks? Yes, there are two. According
to Rocks and minerals (Zim 111 and116) they
are intrusive and extrusive. Intrusive igneous rocks are formed below
the surface but ones formed near the surface usually become extrusive.
The process to becoming intrusive is gradual one which many liquids and
gazes stay longer. The other type of igneous rocks are extrusive
rocks. They come out as lava from a
volcano and then cools.
next question,where and how
are igneous rocks formed? As it says in rocks and minerals (Zim 110)
all igneous rocks are made from lava
cooling and harding but where they do that is what the difference
is. If the rock cools and hardens near or at the surface it becomes
extrusive. If the rock cools or hardens below the surface it becomes
|Our final question, what are
some igneous rocks? As it says in the book Rocks and Minerals (Zim
112and 116-117) you can classify them through the two types we
already know, intrusive and
extrusive. Some intrusive rocks are
granite, pegmatite, syenite, Diorite and gabbro. Some extrusive rocks
are rhyolite, obsidian, andesiteand basalt. If you are wondering what
the ending ite means it means
mineral or rock.
you can see there is a lot
more to rocks then meets the eye. There are different types, they are
made different and there are different types . If you still think that
there just one
don't think that you read this page.
| according to the ap archives in the
hudson middle school