Transcript 13:49, 13 September 2009

Earth Science
Rocks & Minerals
Science for 4th Grade
Rocks contain valuable minerals.
An ore is a rock rich in
valuable minerals that can be
removed from the Earth’s crust.
Workers use machines to dig out
the ore.
Ore has valuable minerals
The iron from hematite is used
for things made of steel.
Ore has valuable minerals
Gypsum is a white mineral
used to make paint and plaster.
Ore has valuable minerals
Halite is rock salt used to make
ice cream.
Ore has valuable minerals
Copper is a metal found is rock
formed from lava and other places.
Ores can protect us.
Lead is a metal from galena and used
in aprons to protect us from harmful
radiation in x-rays.