Understanding Density - Monroe Science Educational Services - Finding the Density Between Intrusive Granite and Extrusive Basalt Rocks

Name:_______________________________________________ Period:_________

Finding the Density Between Intrusive Granite and Extrusive Basalt Rocks

Purpose: To determine the specific density between 2 types of igneous rocks; intrusive granite and

and extrusive basalt.

Research: Intrusive rock is rock formed from magma below the Earth’s surface or inside the Earth;

they are also called magmatic or plutonic rock. Extrusive rock is rock formed by lava

near or on the Earth’s surface (exiting the Earth); they are also called volcanic rock.

Density = __mass(g)__ measuring mass – weight in grams(g)

volume(cm3) measuring volume - 1cm3 = 1ml

Hypothesis: From what I know about intrusive and extrusive rock, ___________________________

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Materials: worksheet, electronic scale, graduated cylinder, pie pan tray, displacement container,

large cup of water, 6 rock samples (3 each), paper or plastic catch cup, calculator.

Procedures: Obtain all materials. Identify the rock samples. Then, using the scale weigh each (dry)

rock and record the mass; make sure to be accurate to the tenths (00.0g). Place the

displacement container in the pan and the catch cup under the spout to

capture the water overflow. From the large cup of water, fill up the displacement

container until the excess water begins to drip out of the flow port. *Hint: you may have

to put your finger over the spout and pull off quickly to begin the process (vapor lock).

Pour the excess water in the catch cup back in the large cup. Carefully, drop a rock in

the displacement container and capture the displaced H2O into the cup. Measure the

displaced water by pouring the water from the cup into the graduated cylinder. Record

the volume in cm3 and pour back in the large cup. Leaving the rock in the displacement

container repeat for the next rock sample. Repeat for all rocks.

Calculate the density for each sample by using the formula g/cm3; read grams per cubic centimeter.

Results: granite#1 granite#2 granite#3 basalt#1 basalt#2 basalt #3

Mass: ________ ________ ________ ________ _________ _________

Volume: ________ ________ ________ _________ __________ _________

Density: granite #1 _________________ g/cm3 basalt #1 _________________ g/cm3

granite #2 _________________ g/cm3 basalt #2_________________ g/cm3

granite #3 _________________ g/cm3 basalt #3 _________________ g/cm

Analysis & Conclusion: (Remember to answer your hypothesis.) ___________________________

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Claim – Evidence - Reasoning

Claim: __________________________________________________________________________

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Evidence: _______________________________________________________________________

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Reasoning: ______________________________________________________________________

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