1.2 Watch out for concrete
Having learned about the three different types of rocks, complete the activity below.
Activity 1.1 Concrete
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?
The correct answer is a.
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.