What is the minimum depth needed for a feature to be considered a canyon?
What is the rate of species and how does this relate to finding transitional species?
What is inorganic matter?
What is pyrite?
Explain where are mountains of the moon?
What is asphalt?
What is crude?
Which is the largest reef?
What is lava?
What is the difference between a semi-precious and a precious stone?
Explain what did radon detection in arid areas can help to explore?
What is cathode?
Explain where would you expect to find the oldest basalt on the floor of the atlantic ocean?
What is the name of the largest volcano in the world?
What is crystal?