Geologic History Readings

What did Marie Curie discover in 1898?

• radioactivity

• uranium-lead

• continental drift

• convection currents

Strata is another name for _____________________

• rocks

• layers

• mountains

• fossils

We are currently in which epoch?

• paleocene

• cenocene

• holocene

Anthropo means

• human

• woman

• insects

• man

Why was finding iridium important?

• Tells us when the Grand Canyon formed

• Tells us when the first atomic bomb was launched

• Explains why dinosaurs vanished

• Helps us figure out how old a rock layer is

What are the 3 pieces of evidence that an asteroid hit the Earth and wiped out the dinosaurs?

• Impact crater off of the Yucatan peninsula

• Chunks of asteroid have been found in Mexico

• Layer of iridium across the world

• Signs of an ancient tsunami

What theory was proposed in the 1920s?

• continental drift

• Pangea

• convection currents

• sea floor spreading

What causes the continents to move?

• convection currents in the mantle

• ocean currents

• wind currents

• volcanic activity

Are dinosaur fossils found above the iridium layer?

• Yes

• No

True of False: Earth's crust is constantly being recycled.

• True

• False