Access Prior KnowledgeLesson 6: How are rocks classified?

Opening ActivityOpen 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.

1 In general, all rocks are formed in thesame way.

Yes

No

Do you agree with the statement?

2 Igneous rock is formed by pressing layers ofrock together.

Yes

No

Do you agree with the statement?

3 Many fossils can be found in sedimentary rock.

Yes

No

Do you agree with the statement?

4 Rocks can change from one type of rock toanother, or not change at all.

Yes

No

Do you agree with the statement?

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 paragraphpg. 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 paragraphpg. 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 paragraphpg. 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 paragraphpg. 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

MetamorphicIgneousSedimentary

MatchQuest

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.