Science 7-1
a layer of slowly flowing rock in the mantle
asthenosphere
Why do scientist look to the ocean floor to research the mantle?
because the mantle has lava/volcanoes and chunks of lava were found in the ocean.
a substance composed of two or more elements is a
compound
list the three layers of the Earth, cased on their chemical composition
crust, mantle and core
Why do less dense compounds make up Earth's crust while the densest compounds make up the core?
heavier element is pulled toward the center earth. less element is farther
the solid layer of the core
inner core
What element makes up most of the Earth's core?
iron
The earth is composed of several
layers
the outermost,rigid layer of the Earth
lithosphere
Oceanic crust id denser than the continental crust because it contains more of which three elements?
magma, rock and iron
The mantle is composed of more of the element ___________ than the crust is.
magnesium
the strong, lower part of the mantle
mesosphere
What are the two kinds of crust that a tectonic plate may contain?
oceanic crust and continental crust
the liquid layer of the core
outer core
What do scientists use to study Earth's interior?
seismic waves
What three elements make up most of the Earth's Crust?
silicon, oxygen and aluminum
The mantle has less aluminum and less __________________ than the crust does.
silison
large pieces of the lithosphere that move around on the asthenosphere are called
tectonic plates
Why are tectonic plates like the pieces of a jigsaw puzzle?
they come apart with a missing piece and fit together
list three ways in which tectonic plates floating on the asthenosphere are similar to ice cubes filing a punch bowl
they fill the top so nothing gets in or out and some pieces fall up under one another. move around/asthenosphere
What are seismic waves?
vibrations from an earthquake
How much of the Earth's mass is made up by the core?
3,450 KM
Will a seismic wave traveling through a solid go faster or slower than a seismic wave traveling through liquid?
Faster, it will hold it from the substance. solid is one piece so it can go over or to the sides
