Question | Answer |
convergent boundary | where two plates come together |
outer core | 2,266 km thick mostly made up of metals iron and nickle consist of two parts outer and inner |
plate tectonics | explains theory formation movement and subduction of Earth's plate |
subduction | Process in which crust sinks back into the mantle through deep oceans |
Pangaea | Greek for all lands, German scientist said contenents drifted together |
divergent boundary | where two plates move apart |
transform boundary | where two plates slide past each other causing earthquakes |
seismic waves | waves cause by earthquakes |
basalt | dark rock found on ocean crust |
granite | rock found on continental crust |
mantle | hot solid rock over 3000 kms |
lithosphere | upper more part of the mantle |
asthenosphere | below the lithosphere |
lower mantle | beneath the asthenosphere and is soilid |
convection current | a cycle of heated molcules floating to the surface and then sinking when it cools |
convection currents in earth | heat from the core and mantle |
conduction | the way heat travels in matertials by tounching each other |
radiation | heat transfers through heat waves |
deep ocean trench | a valley along the ocean floor which crust sinks in to the mantle (subduction) |
fossil | ancient organism that has been preserved by rock |
continental drift | Wegener hypothesis that all continents were together |
sonar | a device that determines the distance of an object under water be recording echoes of sounds waves |
rift valley | a deep trech caused by divergent boundary |
crust | layer of rocks that forms the Earth's surface |
layers of the Earth | crust, mantle, lithosphere Asthenosphere, lower mantle, outer core inner core |
inner core | most dense part many people would think there would be hot lava there but it is actually it is solid iron and nickel |