Answer:c
Explanation:
A valley will be carved out due to erosion.
Money so i can get a nice body with the money hahah
When acids react with water, H ions are released which then combine with water molecules to form H₃O⁺
Answer:
B They move because of the convection currents in the mantle.
Answer:
D. 0.75 grams
Explanation:
The data given on the iridium 182 are;
The half life of the iridium 182,
= 15 years
The mass of the sample of iridium, N₀ = 3 grams
The amount left, N(t) after two half lives is given as follows;

For two half lives, t = 2 × 
∴ t = 2 × 15 = 30


∴ The amount left, N(t) = 0.75 grams