This investigation presents an online key for identifying
real rocks (not rock images). On the Web pages, you'll
answer a series of questions about a rock to come up
with its type (igneous, sedimentary, or metamorphic)
and its name. Tools such as a hand lens or magnifying
glass, dilute hydrochloric acid, and a nail for testing
hardness will be necessary for some of the tests.
! Before you start, you'll need a rock sample in your
hands. To begin using the rock identification key:
1. Record the rock's sample number on your table.
2. Describe the texture and color or composition of