Earth and Space
What is the solar system?
the sun and all the planets and other objects that circle around it
What is the equator?
an imaginary line that circles the Earth halfway between the North and South Poles
What is the core?
the layer at the center of the Earth
What is the prime meridian?
the 0 degree line of longitude, also called the international date line
What is a trench?
a deep long valley in the ocean floor
What is an orbit?
a closed curved path
What is an axis?
an imaginary line that runs from one pole, through the center of the Earth to the other pole
What is the mantle?
How many time zones are there in the whole world?
24
What is magma?
How long ago do scientists think the Earth was formed?
4.5 billion years ago
a sphere, or ball, that has a map of the Earth on its surface
What is the crust?
The outer layer of the Earth
How many time zones in the US?
4
What is an earthquake?
a sudden violent shaking of the Earth
What is the theory of plate tectonics?
the theory that the Earth's crust is made up of plates that slowly shift position
a line that circles a globe, runs eat to west
on the crust
How many degrees are covered by each time zone?
About 15 degrees
What is lava?
magma that has reached the Earth's surface
What is a geologist?
a scientist who studies rocks to learn about the history and structure of the Earth
What is a line of longitude?
Is the mantle hot or cold?
very hot
How long does it take the Earth to rotate 15 degrees?
One hour
What is Pangaea?