Ch. 3 Sec. 2 Ch. 3 Sec. 2 Properties of MagmaProperties of Magma

element

• substance that cannot be broken down into other substances

• ex: carbon, hydrogen

compound

• substance made of 2 or more elements that have been chemically combined

• ex: water, carbon dioxide

physical property

• any characteristic of a substance that can be observed or measured w/out changing composition of substance

• ex: freezing point

chemical property• property that

produces change in composition of matter

• ex: ability to burn

viscosity• physical property

• resistance of liquid to flowing

• greater viscosity-slower it flows

Question: How Fast do Liquids Flow?• Hypothesis: I predict that ____________ • Procedure: See page 87

Liquid Time Flowed-Fast or slow/

ViscosityHoney 98 sec Slow-greater

viscosity-highVegetable Oil 53 sec fast-lower

viscosity-low

low viscosity

high viscosity

high viscosity

low viscosity

high viscosity

low viscosity

viscosity of magma

• depends on silica content & temp.

• silica= oxygen + silicon

• more silica higher viscosity

pahoehoe• fast-moving, hot lava• low viscosity• looks like solid mass of wrinkles,

billows & ropelike coils

http://www.youtube.com/watch?v=0jry-iMXjik

aaaa

aa surge

• cooler & slower than pahoehoe

• hardens into rough chunks

http://www.youtube.com/watch?v=iyIV5fd1Aww

How are pahoehoe and aa different?

The viscosity of magma depends

on what two factors?

1. silica content

2. temperature

compound

• substance made of 2 or more elements that have been chemically combined

element

• substance that cannot be broken down into other substances

chemical property or physical property?

•ability to burn

chemical property

low viscosity

high viscosity

high viscosity

low viscosity

high viscosity

low viscosity