Question

Which is the most abundant element in the Earth's crust?
a. nitrogen
b. ammonia
c. oxygen
d. hydrogen​

Answer 1

Answer:

hydrogen is the answer for it

Answer 2

Answer:

$</p><p><strong>Oxygen</strong><strong>.</strong><strong>.</strong><strong>.</strong><strong>.</strong><strong>.</strong><strong>.</strong><strong> </strong></p><p>$