Question

mantle is almost 3000 km deep. this layer consists of metals like __________, ________ and silicate rocks. the approximate percentage of constituent elements of the mantle layer are as follows; 45% __________, 21% silicon and 23% magnesium.

Explanation:

The mantle is Earth's layer composed of iron and magnesium-rich silicate rocks. Oxygen is the most abundant element in the mantle, making up about 45% of its composition, followed by silicon (21%) and magnesium (23%).

Answer:

1. magnesium, iron
2. oxygen