Explain scientifically how we know that Earth's crust is broken into pieces (plates). (explanations must be multiple sentences)

Answer and Explanation:

Earths crust is broken into plates called tectonic plates.  the plates move bc of  convection currents in the earths mantle.   convection currents are the movement caused with a liquid by the propencity of hotter and less dense matter to rise, and colder, thicker material to sink under the effect of gravitational pull, which as a result results in the transfer of heat.  As a result these are moved by the heat composed by the common natural blight of radioactive component in the earth.

Earths crust is broken into plates called tectonic plates.  the plates move bc of  convection currents in the earths mantle.   convection currents are the movement caused with a liquid by the propencity of hotter and less dense matter to rise, and colder, thicker material to sink under the effect of gravitational pull, which as a result results in the transfer of heat.  As a result these are moved by the heat composed by the common natural blight of radioactive component in the earth.

Explanation:

(4,-2)

explanation:

6x+4y=16

-6x-9y=-6

-5y=10

y=-2

x=4