Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals.
The most likely purpose Congresswoman Chisholm included this statement in her speech is to explain how she felt about being discriminated against not only because of her race but also because of her gender.
