Question

arrows pointing down from location 1 to location 3
a label of convection currents pushing the continental crust at location
arrow heads to the two circles to show currents moving upward to location 1
a label indicating the composition of the inner core as solid iron and nickel
which of the following should be added to the diagram?
image from hmh textbook resources
the diagram shows a cross - section of earth.

Explanation:

Convection currents in the mantle are responsible for the movement of tectonic plates. In the diagram, a label indicating convection currents pushing the continental crust at location 1 (which is likely a divergent boundary where new crust is formed as magma rises due to convection) is necessary. Arrow heads to the two circles (mantle) to show currents moving upward to location 1 aligns with the concept of convection (hotter, less - dense material rising). A label of convection currents pushing the continental crust at location 1 is a key element related to plate tectonics and mantle convection.

A label indicating the composition of the inner core as solid iron and nickel is about the Earth's core, not directly related to the process shown in the diagram (which seems to focus on mantle - crust interaction). Arrows pointing down from location 1 to 3 would be incorrect as convection currents at a divergent boundary (like location 1 might represent) have upward - moving currents.

Answer:

A label of convection currents pushing the continental crust at location 1.