In the kiln, quicklime reacts with other minerals to make clinker. When hot clinker comes out of the kiln, it flows like lava! As clinker cools, it forms small marble-sized gray balls. Clinker is then ground to a fine powder and mixed with a substance called gypsum to make cement.

Question

small, gray marble-sized clinker
Complete the sentences.
When heated in a kiln,
reacts with minerals to form
. Then,
is added to the cooled powder to make cement.

Answer 1

When heated in a kiln, quicklime reacts with minerals to form clinker. Then, gypsum is added to the cooled powder to make cement.