殻

diastrophism (movement and deformation of the earth's crust)

shell

cigarette end

(Earth's) crust

seashell

continental crust

electron shell

grounds (of tea and coffee)

grounds (of tea and coffee)

shell

Ghost in the Shell (film)

shell structure

hard-shelled nut (e.g. walnut, pecan, almond)

sea shell

empty shell

skeleton shrimp (Caprella mutica)

conchoidal fracture

conchoidal fracture

(coal) cinders

putamen (part of brain)

cottony cushion scale (species of scale insect, Icerya purchasi)

to break up and start anew

ostracism

(theory of) isostasy

hull

isostasy

cast-off skin (snake, insect, etc.)

bivalves

crustacean

shellfish allergy

Fowler's snake eel (Ophichthus erabo)

Japanese wineberry (Rubus phoenicolasius)

adductor muscle (of a bivalve)

rapeseed hulls

carapace

Crustacea

used tea leaves

to close up like an oyster

to withdraw into oneself

closed shell

embers

grayish-blue (color)

eggshell

eggshell

(coal) cinders

external ear

ice crust

onigara yaki

red iron oxide

remnants of a bean plant

shoulder blade

apex of a shell

buckwheat chaff

scale insect

ashes

Rostroconchia (class of extinct molluscs)

cochlea

completely empty (of a residence, etc.)

shelling (e.g. of eggs, nuts, crabs and such)

coconut shell

crab shell (often ground or crushed and used as fertilizer)

cupule

titan triggerfish (Balistoides viridescens)

clown triggerfish (Balistoides conspicillum)

blackbelly triggerfish (Rhinecanthus verrucosus)

rice husks

flail (for threshing grain)