The answer is b an astronomical unit
Mansa Musa. the pilgrimage journey exposed Mali to Europe and the Middle East. The king had carried 30,000 pounds of gold, which signified the immense wealth in his empire. This created an impression on his acquaintances.
Answer:
I believe its C
Explanation:
C because when you'll have control over the variables (salt and water) You can measure how much salt or water is actually needed to determine the freezing temp.