3. A rock that contains crystals and fossils is likely to be a __________________________ rock. Group of answer choices Igneous intrusive Igneous extrusive Sedimentary Metamorphic
3.
All minerals are crystals. Crystals are solid and have a regular atomic structure and chemical composition. Crystals can be organic and inorganic. Limestone precipitation from organic is a crystal.
Igneous rocks-
Igneous rocks are formed from the solidification of magma either above the surface or below it. The rock which forms above the surface we call it an extrusive rock and the rock which forms below the surface we call it an intrusive rock.
Igneous rocks are interlocking in texture and devoid of any fossils. They are formed at such a high temperature that the organic remains get destroyed at that temperature.
Sedimentary rock-
Sedimentary rocks are formed from the deposition of the broken fragments from the pre-existing rock. The deposited fragments when diogonised and lithified we get sedimentary rocks.
Sedimentary rocks are characterised by bedding and devoid of any interlocking grain texture. They are layered and contain many fossils.
Metamorphic rocks-
Metamorphic rocks are formed from the solid state change of other pre-existing rocks. Here pressure and temperature plays an important role in the formation of metamorphic rocks.
Metamorphic rocks start to form at 150 °C which can destroy all the organic remains so we don't have any fossils in metamorphic rocks.
Step by step
Solved in 3 steps
