Question

average chemical composition— set 1 —— set 2 —1. earths hydrosphere is best described as the(1) solid outer layer of earth(2) liquid water layer of earth(3) magma layer located below earths stiffer mantle(4) gaseous layer extending several hundred kilometers from earth into space1 ______2. what are the two most abundant elements by mass found in earths crust?(1) aluminum and iron(2) sodium and chlorine(3) calcium and carbon(4) oxygen and silicon2 ____3. earths troposphere, hydrosphere, and lithosphere contain relatively large amounts of which element?(1) iron (3) hydrogen(2) oxygen (4) potassium3 ____4. which graph correctly represents the 3 most abundant elements, by mass, in earths crust?(1)(2)(3)(4)4 ____5. the most abundant element by volume in the hydrosphere is(1) oxygen (3) nitrogen(2) hydrogen (4) silicon5 ____6. which metal is most abundant by mass in the crust?(1) iron (3) magnesium(2) aluminum (4) copper6 ____7. in which sphere would one find more total oxygen by volume?(1) the crust(2) the atmosphere(3) the hydrosphere(4) the mesosphere7 ____8. which two elements would equal almost 75% of the total mass of the crust?(1) o and si (3) si and al(2) o and al (4) si and fe8 ____9. the pie graph shows the elements comprising earths crust in percent by mass.which element is represented by the letter x?(1) nitrogen (3) iron(2) lead (4) hydrogen9 ______average chemical composition of earths

Explanation:

1. The hydrosphere is Earth's liquid water layer.
2. Oxygen (~46.6%) and silicon (~27.7%) are the two most abundant elements in Earth's crust by mass.
3. Oxygen is abundant in the troposphere (as O₂), hydrosphere (in H₂O), and lithosphere (in rocks/minerals).
4. The top 3 elements in Earth's crust by mass are oxygen (highest), silicon, then aluminum, matching graph (4).
5. The hydrosphere is mostly water (H₂O); hydrogen makes up ~66.7% of its volume.
6. Iron is the most abundant metal by mass in Earth's crust (after oxygen and silicon).
7. The crust has oxygen bound in rocks/minerals, making its total oxygen volume the highest.
8. Oxygen (~46.6%) and silicon (~27.7%) sum to ~74.3%, nearly 75% of the crust's mass.
9. After oxygen, silicon, aluminum, iron is the next most abundant element in the crust, matching "X".

Answer:

1. (2) liquid water layer of Earth
2. (4) oxygen and silicon
3. (2) oxygen
4. (4)
5. (2) hydrogen
6. (1) iron
7. (1) the crust
8. (1) O and Si
9. (3) iron