International concern for the protection of environment is the subject matter of :
AStockholm Declaration
BParis Convention
CGeneva Declaration
DAll the above
AStockholm Declaration
BParis Convention
CGeneva Declaration
DAll the above
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ഒരു മൂലകം മാത്രമുള്ള ധാതുക്കളുടെ ഉദാഹരണം ഇവയിൽ ഏതെല്ലാമാണ് ?
Which of the following statements related to the ionosphere is true?