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An introduction to geology
An introduction to geology

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1.2 Watch out for concrete

Having learned about the three different types of rocks, complete the activity below.

Activity 1.1 Concrete

Timing: Allow about 2 minutes

Concrete is a building material that has been used since pre-Roman times. It is a mixture of sand and gravel held in a matrix of cement. Sound familiar? It should do, but which type of naturally occurring rock does concrete resemble?

a. 

sedimentary rock


b. 

metamorphic rock


c. 

igneous rock


The correct answer is a.

Discussion

Some concrete really can look like a rock, so be careful when you go out and find your own rocks to identify later in the course.