7I Earth Flashcards
What rock type is formed from cooled molten rock?
Igneous
What rock type is formed from broken down pieces of other rocks?
Sedimentary
What rock type is formed from rocks being put under intense heat and pressure?
Metamorphic
What are the 4 layers of the Earth?
Crust, Mantle, Outer core, Inner core.
What is a tectonic plate?
A large section of the crust.
What is a fossil?
The ancient remains of animals or plants preserved in rock
What is the rock cycle?
A model that shows how the rock types interact with each other.
Why do scientists use models?
To represent things that are too big or small to understand, to represent abstract ideas.
How long does it take for the Earth to rotate once on its axis?
24 hours
How long does it take for the Earth to orbit around the Sun once?
365.25 days
Why do we have a leap year every 4 years?
The 0.25 days in 365.25 add up every 4 years.
What is the name of our galaxy?
The Milky Way
Why do we have seasons on Earth?
The Earth is tilted on its axis.
Why is it Summer in the northern hemisphere when it is Winter in the southern hemisphere?
When one hemisphere is tilted towards the sun it is summer, the other hemisphere is tilted away from the sun it is winter.
Why do we have day and night on Earth?
The Earth rotates on its axis
