Straw, cement, or manure added to a standard adobe mixture can produce a stronger, more crack-resistant brick.
stɹˈɔː, sᵻmˈɛnt, ɔːɹ mənjˈʊɹ ˈædᵻd tʊ ɐ stˈændɚd ɐdˈoʊbi mˈɪkstʃɚ kæn pɹədˈuːs ɐ stɹˈɔŋɡɚ, mˈoːɹ kɹˈækɹᵻsˈɪstənt bɹˈɪk.