Revision of the earth

04.29.2020
09:30:56
Dear students, good morning
Today's revision concept in earth : igneous rocks
Pg.no : 108 & 109
The important points are
1. Igneous rocks are formed from magma
2. When magma cools down slowly ,rocks containing large crystals are formed
3.When the magma cools quickly, rocks with small crystals or no crystals are formed
4.Valcanoes :
When magma reaches the surface of the earth it is called lava
5. The lava erupts from valcanoes.
No homework
For better understanding of concepts watch the below videos