I'm in the area where you get the spring ball, wave beam, and high jump. Judging from a map I found on the internet, there is only one metroid in this area that I haven't beaten. It's up in the upper-left corner, too high for me to reach with high jump and I can't use spider ball to get to it because there are spikes on the wall. Am I supposed to be able to reach this metroid somehow at this point in the game? I'm pretty sure I haven't triggered the earthquake needed to progress past this point, and this metroid is the only thing left in this area that I haven't gotten to yet.
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