Access Prior Knowledge
Lesson 6: How are rocks classified?
Opening Activity
Open Science textbook to page 286.
Open Science workbook to page 91A to review home learning.
Open Science folder to review vocabulary words and outline for the chapter.
Open Science journal and answer the following questions:
1. What are the causes of erosion?
Review Content Cards and Q-Cards in bin, sharing with partners quizzing each other quietly.
Log in to clickers using student ID number.
Be ready to review home learning when timer goes off.
Don't forget to write your home
learning in your agenda page 93A.
Do you agree with the statement?
1
Yes
No
In general, all rocks are formed in the
same way.
Do you agree with the statement?
2
Yes
No
Igneous rock is formed by pressing layers of
rock together.
Do you agree with the statement?
3
Yes
No
Many fossils can be found in sedimentary rock.
Do you agree with the statement?
4
Yes
No
Rocks can change from one type of rock to
another, or not change at all.
Igneous Rocks
Igneous rocks form when melted rock cools and hardens
forming mineral crystals.
Large crystals form when the rock cools slowly, like in granite.
Small crystals form when the rock cools quickly, like in basalt.
First paragraph
pg. 286
Sedimentary Rocks
Sedimentary rocks form when layers of materials and sediments settle on top of each
other.
These sediments harden and natural chemicals act like cement holding the
sediments together, like in sandstone and conglomerate.
Fossils often form in sedimentary rock.
Fourth paragraph
pg. 286
Metamorphic Rock
Certain conditions are necessary for metamorphic rock to form.
Solid rock must be squeezed and heated to high temperatures.
This causes rock particles to form a new pattern, change the properties and may form new
minerals, creating a metamorphic rock.
Second paragraph
pg. 287
Rock Cycle
Rocks can change from one kind of rock to another in the rock cycle.
Heat and pressure can change igneous rocks into metamorphic rocks.
Cooling can change metamorphic rocks into igneous rocks.
Weathering can change metamorphic or igneous rocks to sedimentary rocks.
First paragraph
pg. 288
Rock Cycle
Relative Ages of Rocks
Rock layers at Earth’s surface are younger than rock layers below
them.
Events like earthquakes and volcanoes can make these layers
bend or turn over.
Types of Rocks
MatchQuest
Sedimentary
Igneous
Metamorphic
TextQuest
Answer questions in your Science journal.
1. How can you identify an igneous rock?
2. When looking at layers of rocks, where would the oldest
rock be found?
3. How can rocks change from one kind to another?
Don't forget to write your home
learning in your agenda page 93A.