Without counting them one-by-one, how many orange
tiles should you buy for the border of the Kelly's 5 x 5
swimming pool?

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south

What is the approximate chemical composition of the solar nebula?

What is the pattern of urbanisation around the word?