7) What are stromatolites?

43) Measurement of the position of the peak in an object’s thermal spectrum is a measure of its

22) Spectra from neutral atoms compared with spectra from ionized atoms of the same element

26) Most of the materials that make up Earth and all life on Earth, including humans, were formed:

10) Which of the following helps rock to melt?

49) Scientists today are interested in searching for life on Mars because:

Normal respiratory variations in venous blood flow are termed:

31) Among the other planets, probably the most likely place to find evidence for life either now or in the past is on

45) Galileo discovered that Venus goes through a cycle of phases like the Moon. This suggested that

14) From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?