week 16
what are the three main layers of the Earth?
the three main layers are mantle, outer core and inner core. the mantle has magnetic fields generated within by the core. the outer core is molten iron and slowly circulates. The inner core is very hot and magnet fields develop around the planet.
what is the purpose of a map?
they are used to depict almost any kind of geographical information.
where does the water in a river come from?
it comes from run-off, rainwater, springs, and glaciers.
what are the 5 major seas?
artic ocean in the north, Southern Ocean in the south, Pacific Ocean on both sides of the Earth, Atlantic Ocean in the middle, and the Indian ocean near the Southern Ocean.
where are glaciers found?
they are usually found on mountain tops in u and V-shaped valleys.
How is the Earth's magnetic field created and why is it important?
the magnetic field is generated by the core and are dampened by the mantle. it is important because it defects electricity charged particles from the sun and shields us from harmful radiation created by the electrical currents generated in a circular molten iron.
what is the purpose of the lines that you find on a globe?
the purpose of the lines on a globe is that it helps us measure distance and find places.
describe a river's course.
Water starts on a mountain and flows downward into streams and merge into a river. then flows until it ends.
how much of the Earth's surface is covered with water?
(2/3) or 70% of Earth is covered in water.
how do glaciers form?
it starts snowing, then all the snow turns into hard ice. it snows over and over again until all the pressure in the ice gets very heavy, then it goes down.
inside the earth
crust, mantle, outer core, inner core
how are lines of latitude measured?
lines of latitude are measured at angles north or south of the equator and runs parrallel.
how do rivers erode the landscape around them?
picking up debris like rock, pebbles, and sand causes the land around them to erode.
why are the ocean depths so difficult to explore?
Because the ocean floor pressure is 400 times more as the air pressure on Earth.
how do lines of longitude differ from lines of latitude?
lines of longitude divide Earth through each pole.
where is a river delta found and what happens at this point in the river?
it usually builds up on islands, fresh and saltwater mix.