Find two possible next terms if it is neither arithmetic arithmetic nor geometric: 1, 10, _, _.

Distance that the transcontinental railroad covered from omaha to san francisco.

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies?

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed