21. The one thing that is common to all fossil fuels is that they: 21.1 contain carbon 21.2 were originally formed in marine environment 21.3 have undergone the same set of geological processes during their formation 21.4 represent the remains of one living organisms 21.5 none the above 21.6 ignore question 22. What is the name of the Mesozoic supercontinent that consisted of all the preser continents? 22.1 Eurasia 22.2 Pangaea 22.3 Laurasia 22.4 Gondwanaland 22.5 none the above 22.6 ignore question 23. When did the supercontinent Pangaea begin to break apart? 23.1 about 10,000 years ago 23.2 about 10 million years ago 23.3 about 200 million years ago 23.4 about 570 million years ago 23.5 none the above 23.6 ignore question 24. Which plate is being subducted beneath western South America? 24.1 the Pacific plate 24.2 the South American plate 24.3 the Nazca plate 24.4 the South Atlantic plate 24.5 none the above 24.6 ignore question 18/23 25. Which of the following sequences correctly lists the different arrivals from first to last? 25.1 P waves .... Surface waves .... S waves 25.2 Surface waves .... P waves .... S waves 25.3 P waves .... S waves .... Surface waves 25.4 S waves .... P waves .... Surface waves 25.5 none the above 25.6 ignore question 1 26. Which of the following is not a divergent plate boundary? 26.1 The San Andreas fault 26.2 The East Pacific Rise 26.3 The Great Rift Valley of East Africa 26.4 The Mid-Atlantic Ridge 26.5 none the above 26.6 ignore question