によって Travis Green 4年前.
205
Three mian rocks
Rocks are classified into three main types: igneous, metamorphic, and sedimentary. Igneous rocks, derived from magma, are often referred to as fire rocks and can be billions of years old.
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Three mian rocks metamorphic 1.serpentinite 2.phyllite 3.migmatite
4.quartzite
5.slate
3. That little pebble may be billions of years old. 2. For example, limestone eventually can turn into marble. 1.Metamorphic means changed form sedimentary 1.chalk 2.claystone 3.coal
5.limestone
4.greywacke
3. It means sitting rock. 2.This type of rock is formed from igneous rocks that break down into smaller pieces and fall to the ground or to the bottom of a lake or river. 1.After many years layers of these tiny pieces of rock pile on top of one another. Igneous 5.basalt 4.obsidian 3. nepheline 2.diorite 1.tuff 3. Igneous means fire rocks. 2. Some are billions of years old! Rocks come in many sizes. 1.Magma is the heart of any igneous rock.
