Answers26-27 - C - RUSD Biology in the Living EarthGeologic Time: Early Earth

Geologic Time: Early Earth — Quiz Answers

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Which statement best compares a craton and a Precambrian shield?

A
Cratons are stable continental cores, while shields are exposed portions of cratons.
B
Cratons are exposed at the surface, while shields lie deep underground.
C
Cratons are older than shields, which formed during the Mesozoic Era.
D
Cratons are oceanic crust, while shields are volcanic regions.
4
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Why do scientists use both ancient Earth rocks and meteorites to understand Earth's early formation?

A
Earth rocks always contain fossils.
B
Meteorites are chemically identical to Earth rocks.
C
Meteorites prove that Earth's layers never differentiated.
D
Meteorites preserve information lost on Earth due to tectonic activity.
5

Which method allows scientists to determine the age of events like early crust formation and the Great Oxygenation Event?

A
counting sediment layers in canyons
B
analyzing ice core data
C
observing current volcanic eruptions
D
radiometric dating ancient rocks
7

Move each answer to the correct box to classify each item as a geologic time interval or a geologic structure.

Answer:

Archean Eon,Hadean Eon,Precambrian time|craton,microcontinent,Precambrian shield

8

Why do scientists use eons, eras, and periods to divide the geologic time scale?

A
to preserve the system as it was originally designed by its creators
B
to separate regions of Earth by continent
C
to mark significant geological and biological changes over time
D
to organize Earth's history by evenly spaced time intervals

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Geologic Time: Early Earth — Quiz Answers…