Arunner wants to run 12.3 km . she knows that her running pace is 6.8 mi/h.
how many minutes must she run? hint: use 6.8 mi/h as a conversion factor between distance and time.

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

All of the following are part of the biosphere except

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains