6. DIFFERENT TYPES OF ROCKS
There are three different types of rocks :
Igneous rock
Sedimentary rock
Metamorphic rock
7. IGNEOUS ROCKS
• When the molten magma cools, it becomes solid. Rocks thus
formed are called igneous rocks or primary rocks
there are two types of igneous rocks and are:
• Intrusive rocks
• Extrusive rocks
• Intrusive rocks: sometimes the molten magma cools down deep in
side the earth’s crust they form intrusive rocks
• Extrusive rocks: when the molten magma comes out on the earth’s
crust it cools down to be known as extrusive rocks
9. SEDIMENTARY ROCKS
Rocks roll down, crack and hit each other and are broken
down into smaller fragments these are known as sediments
These loose sediments are compressed and hardened to
form layers of rocks . These types of rocks are called
sedimentary rocks
Some examples of sedimentary rocks are shale, limestone ,
sandstone
11. METAMORPHIC ROCKS
Igneous and sedimentary rocks can change into metamorphic
rocks under great heat and pressure
Some of the examples of metamorphic rocks are : schist,
gneiss , philtre
13. Q & A
1)WHAT ARE THE TWO TYPES OF IGNEOUS ROCKS
2)GIVE FEW EXAMPLES OF METAMORPHIC ROCKS
3)HOW ARE SEDIMENTARY ROCKS FORMED
4)WHICH TYPE OF ROCKS DO CHANGE OVER TIME TO
METAMORPHIC ROCKS
Answers
14. Answers
1 the two types of rocks are igneous rocks are extrusive rocks
and intrusive rocks
2 marble, schist , hornfels are few of the examples of
metamorphic rocks
3 when the sediments are compressed with many more
sediments to form the sedimentary rocks
4 sedimentary and igneous rocks change into metamorphic
rocks over time
Q & A