Welcome to Discuss from Spiral logo

Interactive presentation plan for: Rock Classification (copy) period 8

Activity overview:

14 slides

As you know, scientist of all different types use their powers of observation. Geologists (scientists who study the forces that make and shape planet Earth) observe certain characteristics of rocks in order to classify them.

Three Classifications of Rocks

The three things geologists look at are:
Texture: the look and feel of the rock's surface
Color
Mineral composition: the shape and size of crystals in the rocks

Color

Rocks come in many different colors.

TEXTURE

A rock's texture is the look and feel of the rock's surface. Some rocks are smooth and glassy; while others are rough and chalky. Most rocks are made up of particles of other rocks, which geologists call GRAINS. Grains give rocks their texture. Geologist looks at many characteristics to classify a rock. These characteristics are:
GRAIN SIZE
GRAIN SHAPE
GRAIN PATTERN
NO VISIBLE GRAIN

GRAIN SIZE

THERE ARE TWO CATEGORIES OF GRAIN SIZE:
COARSE-GRAINED: grains in the rock are large and easy to see
FINE-GRAINED: grains in the rock are so small that they can only be seen with a microscope.

GRAIN SHAPE

The grains in a rock vary widely in shape. Some grains look like fine particles of sand; while others look like small seeds or stars. Some rocks contain fragments of other rocks. Sometimes the fragments can be smooth and rounded or sharp and jagged looking.

Grain Pattern

Many times grains in a rock form patterns. Some lie in flat layers that resemble a stack of pancakes Other grains form wavy, swirling patterns. Some rocks have grains that look like rows of multicolored beads or like stripes (banded). Other rocks have grains that occur randomly throughout the rock.

No Visible Grain

Some rocks have no grain, even when they are examined under a microscope. Some of these rocks have no grain because when they form, they cool very quickly. This quick cooling gives these rocks the smooth, shiny texture of a thick piece of glass.

Mineral Composition

To determine the mineral composition of a rock, sometimes geologists have to look at a small sliver of a rock under a microscope. In order to do this, geologists have to cut the rock very thin so light can shine through its crystals. Sometimes testing with chemicals can also help determine mineral composition.

Three major groups of rocks

The three major groups of rocks are:
Igneous
Sedimentary
Metamorphic

Igneous Rock

If you predicted Igneous rock, you were right! Igneous rock forms from the cooling of molten rock, either magma below the surface or lava at the surface.

Sedimentary Rock

Sedimentary rock forms when particles of other rocks or the remains of plants and animals are pressed and cemented together. Sedimentary rock forms in layers below the surface.

Metamorphic Rock

Metamorphic rock is formed when an existing rock is changed by heat, pressure, or chemical reactions. Most metamorphic rock forms deep underground.

Test your skills as a geologist:

Discuss makes it super easy to make any slideshow into an interactive presentation

Play this activity

* Whiteboard required for teacher-paced activities

Share on:

Share Rock Classification (copy) period 8 on Google+ Share Rock Classification (copy) period 8 on Twitter Share Rock Classification (copy) period 8 on Facebook Pin Rock Classification (copy) period 8 Email Rock Classification (copy) period 8

Ready to see what else Spiral logo can do?

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

1000s of teachers use Spiral to deliver awesome, engaging activities that capture students' understanding during lessons.

Now it's your turn Sign up

Spiral Reviews by Teachers and Digital Learning Coaches

Spiral
Review of Spiral by teacher: Kathryn Laster @kklaster

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Spiral
Review of Spiral by teacher: Room 220 Math Stars @3rdgradeBCE

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

Spiral
Review of Spiral by teacher: Miss Ord @ordmiss

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

Spiral
Review of Spiral by teacher: Adam J. Stryker @strykerstennis

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!

Spiral
Review of Spiral by teacher: Dr Ayla Göl @iladylayla

A good tool for supporting active #learning.

Spiral
Review of Spiral by teacher: Brett Erenberg @BrettErenberg

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!

Get the Clip Chrome Extension & Create Video Lessons in Seconds

Add Clip to Chrome