Differences between crust and core are

Differences between rocks and minerals are

Formation of rocks is a slow process because of the following reasons
(i) Primary rock is formed from molten magma then it cools and solidified.
(ii) Climate breaks the parent rocks into many smaller pieces.
(iii) Topography helps in weathering of rocks.
(iv) Time is one of the major factor in the formation of rocks

The differences between igneous and metamorphic rocks are as follow

Minerals are naturally occurring substances which have certain physical properties and definite chemical composition. Minerals are very important to humankind. Some are used as fuels. e.g. coal, natural gas and petroleum. They are also used in industries (iron, aluminium, gold, uranium, etc), in medicine, in fertilisers, etc

(a) Iron
(b) Karhai-lron, Ornaments-Gold, silver, Lamp-Brass, Pan/Iava-Iron, Bell-Brass, Hammer-Iron

The earth is made up of several concentric layers with one inside another just like an onion. The basic features of the interior of the earth are
(i) Crust It is the uppermost layer over the earth's surface which is the thinnest of all the layers. It is about 35 km on the continental masses and only 5 km on the ocean floors. The continental mass are made up of silica and alumina. It is thus called SiAl (Si-Silica and AI-Alumina). The oceanic crust mainly consists of Silica and Magnesium; it is therefore called SiMa (Si-Silica and Ma-Magnesium.
(ii) Mantle It is just beneath the crust which extends up to a depth of 2900 km below the crust.
(iii) Core The innermost layer is the core with a radius of about 3500 km. It is mainly made up of Nickel and Iron and is called NiFe (Ni-Nickel and Fe-Ferrous i.e. iron). The central core has very high temperature and pressure.

Rocks are of three major types i.e. igneous rocks, sedimentary rocks and metamorphic rocks.
(i) Igneous rocks When the molten magma cools, it becomes solid. Rocks thus formed are called igneous rocks. e.g. basalt. They are also called primary rocks.
There are two types of igneous rocks
(a) An intrusive rock Sometimes the molten magma cools down deep inside the Earth's crust. Solid rocks so formed are called intrusive igneous rocks, e.g. basalt.
(b) An extrusive rock When molten lava comes on the Earth's surface, it rapidly cools down and becomes solid. Rocks formed in such a way on the crust are called extrusive igneous rocks. e.g. granite.
(ii) Sedimentary rocks It is formed by transported and deposited small fragmented roc ks by wind, water, etc and these loose sediments are compressed and hardened to form layers of rocks. e.g. sandstone is made from grains of sand.
(iii) Metamorphic rocks They are formed due to great heat and pressure over igneous and sedimentary rocks. e.g. clay changes into slate and limestone into marble.