16 Questions
What is the Geologic Time Scale used for?
Dividing Earth's history into different eras and periods
What does an era represent in geologic time?
A major division in geologic time
What does absolute time mean in the context of geologic time?
The age stated in years
What was the significance of the Precambrian era?
It marked the beginning of Earth's formation
What type of rock is formed when magma from within the earth cools and hardens?
Igneous rock
Which major biological event occurred during the Paleozoic era?
Existence of the first fish
What is the thickness of the Earth's outer core?
2000 km
What is the composition of the Earth's inner core?
Solid nickel and iron
During which era did the North America plate move to the west and north?
Mesozoic era
What is the primary characteristic that distinguishes metamorphic rocks?
Undergone transformation by heat and pressure
What major geological event characterized the Cenozoic era?
Interior seas dried up from mountain sediment
What is the primary characteristic of igneous rocks?
Formed from magma cooling and hardening
What are rocks?
Minerals that have lumped together to form a solid mass
What was the major biological event during the Mesozoic era?
"Presence of Dinosaurs"
What does the lithosphere refer to in relation to the Earth?
Cold and fragile layer on Earth's surface
What type of rock is formed from sedimentation and compression?
Metamorphic rock
Explore the concept of geologic time and Earth's formation through the Geologic Time Scale. Learn how physical processes over billions of years shaped Canada's regions and led to the emergence of new life forms after major extinctions.
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