Igneous Rocks
Use the words in the box to fill in the blanks. All of the words will be
used.
200
Iron
Slow
Lava
Fine
1400
Lighter
Dense
Magma
Large
Silicon
Abundant
Formation
Surface
Igneous
Granitic
Basaltic
Radioactive
Crystals
Pressure
intrusive
extrusive
minerals
magnification
Rocks formed from molten Earth materials are __(1)__ rocks.
There are two kinds of molten material: magma and __(2)__. Most
__(3)__ originates 60 to __(4)__ km below Earth’s surface.
Temperatures reach about __(5)__ *C at these depths. __(6)__ and
heat caused by overlying rocks and __(7)___ elements produce magma.
When magma cools below Earth’s surface, it forms __(8)__-grained,
__(9)__ igneous rocks. The __(10)__ of these common rocks grow
large because of the __(11)___ rate of cooling. When magma moves to
Earth’s __(12)__, it is called lava. When lava cools on Earth’s surface,
it forms ___(13)___-grained, __(14)__ igneous rocks. Minerals of
extrusive rocks are so small that ___(15)___ is needed for
identification. Igneous rocks can be classified according to their
___(16)___. They can also be classified by they types of ___(17)___ in
them. ___(18)___ igneous rocks are dark-colored, heavy, and
__(19)__. They contain __(20)__ and magnesium. ___(21)___
igneous rocks are __(22)__ colored and less dense. They contain a lot
of oxygen and __(23)__. Igneous rocks are the most __(24)__ on
Earth.
Igneous Rocks Fill-In-The-Blank Answers
1. igneous
2. lava
3. magma
4. 200
5. 1400
6. pressure
7. radioactive
8. large
9. intrusive
10. crystals
11. slow
12. surface
13. find
14. extrusive
15. magnification
16. formation
17. minerals
18. basaltic
19. dense
20. iron
21. granitic
22. lighter
23. silicon
24. abundant