Questions with the keyword 'oxygen'

• I know we produce a ton of CO2 nowadays and some of it comes from the volcanoes erupting but a long time ago when it by to Ian, Mathew, Naomi Comments: (No comments so far )
• if fire needs oxygen to burn then how can the sun burn if it’s in the space which has no oxygen by to Naomi Comments: (No comments so far )
• I was wondering how do trees produce oxygen by and 1 other. to Edward, Ian, Mathew, Naomi, sakshisharda Comments: (So far, one comment )
• how do astronauts breathe in space? by to Edward, Ian, Mathew, Naomi, sakshisharda Comments: (No comments so far )