Igneous Rocks
What substance needs to cool for an igneous rock to form?
Magma or lava
These are little pieces of rocks, pebbles, mineral grains, and shell fragments that eventually form rocks.
What are sediments?
These 2 things cause metamorphic rocks to form.
What are heat and pressure?
What is it called when the imprint of a plant or animal is trapped in a rock?
Fossil
Name one characteristic of an igneous rock.
glassy, crystalline, holes
Name one characteristic of a sedimentary rock.
Layers, fragile, fossils,
Name one characteristic of a metamorphic rock.
Stripes, bands, crystals, sparkles
What is the scale that is used to measure the hardness of minerals?
Moh's Hardness Scale
This type of igneous rock is black with a glassy texture. We looked at it in class.
Obsidian
Sedimetary rocks occur when a rock weathers or ____________.
Erodes
Give an example of a metamorphic rock.
marble, quartzite, slate,
What is the hardest mineral?
Diamond
Igneous rocks can appear with several different characteristics. What do these changes depend on?
How FAST lava or magma cools.
Name a common place most sedimentary rocks can be found (there is more than one example, just name one)
Lake, river, creek, beach (Near water or where water used be, like a canyon or some deserts)
What is the word geologists use to describe the way light reflects off of a mineral? They are referring to its shine.
Luster
This is another way to identify minerals; it leaves the color of the powder behind when rubbed against a rough white tile.
What is streak?