instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: When there is no mass in a volume of space, the space is not curved. An object passing through such space would follow a straight line in our normal way of thinking of a straight line. Answer: curved
answer:
When there is no mass in a volume of space, the space is not what?

question:
Passage: According to the table, aluminum has an atomic number of 13. Therefore, every aluminum atom has 13 protons in its nucleus. Iron has an atomic number of 26. Therefore, every iron atom has 26 protons in its nucleus. Carbon has an atomic number of 6. Therefore, every carbon atom has 6 protons in its nucleus. Saylor URL: http://www. saylor. org/books. Answer: nucleus
answer:
According to the table, aluminum has an atomic number of 13. therefore, every aluminum atom has 13 protons in its what?

question:
Passage: Most air masses form over polar or tropical regions. They may form over continents or oceans. Air masses are moist if they form over oceans. They are dry if they form over continents. Air masses that form over oceans are called maritime air masses. Those that form over continents are called continental air masses. The image below shows air masses that form over or near North America ( Figure below ). Answer: maritime
answer:
If an air mass forms over an ocean it is called what type of air mass?