Which polygon-shaped sedimentary structures are found in deserts and dry lake beds?

I think the answer here is mudcracks.

Mudcracks are where soil that is high in clay content, such as that found in sedimentary zones like lakes, cracks due to heat. The clay in these soils is very absorbent, much like a sponge. When the soil absorbs large amounts of water and swells, it will look like gooey mud. When the soil drys out, however, like during extended droughts and dry spells or during heat waves, the water in the soil evaporates and the mud shrinks, causing stress fractures in the mud. In deserts, these are common in wadis, or dry riverbeds, and at the basses of foothills and mountains where clay can accumulate.

The slower the drying time, the more regular the crack pattern will be, with strict polygonal cracks forming in the shade.

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Is there a word/phrase for "unperformant"?

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A man has a garden measuring 84 meters by 56 meters. He divides it into the minimum number of square plots. What is the length of the square plots?

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What warning does Chuchundra issue to Rikki?

Chuchundra, the sniveling, fearful muskrat who creeps around walls because he is too terrified to go into the center of a room, meets Rikki in the middle of the night. He insults Rikki by begging him not to kill him. He then insults him by suggesting that Nag might mistake Chuchundra for Rikki. He says, "Those who kill snakes get killed by snakes." He issues this warning to Rikki not to help keep Rikki safe but as a way of explaining why Rikki's presence gives him, Chuchundra, more reason to fear. Chuchundra starts to tell Rikki what Chua the rat told him--but breaks it off when he realizes he might be overheard by Nag. He says, "Nag is everywhere, Rikki-Tikki." Rikki threatens to bite Chuchundra to get him to talk. Even then, Chuchundra won't overtly reveal any information. But he does say, "Can't you hear, Rikki-Tikki?" This is enough of a clue for the clever mongoose. He listens carefully and can just make out the "faintest scratch-s...

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