Which word best describes the upper mantle a) liquid, b) solid, c) plastic-like

I believe the answer is B )solid

Explanation:

It can bend like plastic ,  although the asthenosphere is softer than the rest of the mantle, it's still solid.

B)solid

Explanation:

its usually the layer above the core which is liquid

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer