Question

What is the most common element (by mass) forming the planet Earth?​

Answer 1

Answer:

Trigonometry Ratios Table

Angles (In Degrees) 0° 30° 45° 60° 90° 180° 270° 360°

Angles (In Radians) 0° π/6 π/4 π/3 π/2 π 3π/2 2π

sin 0 1/2 1/√2 √3/2 1 0 -1 0

cos 1 √3/2 1/√2 1/2 0 -1 0 1

tan 0 1/√3 1 √3 ∞ 0 ∞ 0

cot ∞ √3 1 1/√3 0 ∞ 0 ∞

cosec ∞ 2 √2 2/√3 1 ∞ -1 ∞

sec 1 2/√3 √2 2 ∞ -1 ∞ 1

Answer 2

Answer:

The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%. Other elements occur at less than 0.15%