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