Show:
Three Types of Rocks
Rock Type Examples
Rock Tests
History of Rocks
Modern Rocks
100
formed from particles of sand, shale, and pebbles
What are sedimentary rocks?
100
limestone
What is sedimentary?
100
identifying the color of a mineral when it is finely powdered
What is the streak test?
100
period of time wherein our ancestors used rocks as tools
What is the Stone Age?
100
places where sand, gravel, and stone are excavated for building materials
What is a quarry?
200
formed under the surface of the Earth
What are metamorphic rocks?
200
obsidian
What is igneous?
200
determining how hard or soft a mineral is
What is the Mohs Hardness Scale?
200
period of time during which people learned to mix minerals to produce metals
What is the Bronze Age?
200
mostly used for interior walls and floors because it is soft
What is marble?
300
may have tiny holes and spaces
What are igneous rocks?
300
basalt
What is igneous?
300
needed to examine the outside appearance of a specimen
What is a magnifying glass?
300
period about 3,000 years ago
What is the Iron Age?
300
pieces of rocks that have been blasted
What is aggregate?
400
fairly soft and may break apart easily
What are sedimentary rocks?
400
marble
What is metamorphic?
400
tendency for minerals to break apart along a flat planar surface
What is cleavage?
400
used for knives and spears during the Stone Age
What are obsidian and flint?
400
hard stone that resists wear and tear
What is granite?
500
formed from magma
What are igneous rocks?
500
gneiss
What is metamorhpic?
500
used to determine if specimen contains calcium carbonate
What is the acid test?
500
to melt using high heat
What is smelting?
500
aggregate mixed with cement
What is concrete?