Salt is a resource that is vital to life. Since ancient times, people have used it to preserve and flavor food. But what is salt, and how wasit formed? How do we extract it from the ground or seas and precess it? Will it ever runout? And how can thie essential substance be harmful if we consume to much of it.
Publisher: North Mankato, MN. : Smart Apple Media, 2005
Characteristics: 32 p. : ill. col. ; 26 1/2 cm.