Question

Movie

Watch the movie to learn how scientists study rock strata to make a timeline of Earth’s history. As you watch, record any observations that help you answer the Guiding Question.


1
According to the movie, how do rock strata form?


A
Gravity causes sediment to settle in layers

B
Earthquakes create large slices in existing rock

C
Layers are pushed upward from Earth’s core

D
Changes in air pressure push rocks downward

Answer 1

A

Rock strata form as sediment settles out of water or air under gravity, building up layer upon layer that later compacts and hardens into rock.