Question

question 7 (1 point)
when we look at the internal structure of each of the terrestrial planets, we find that the _?_ metals are in a central core, with the _?_ silicates near the surface. this leads us to conclude that, although the terrestrial planets are solid today, at one time they must have been hot enough to melt.
o a densest/lighter
o b lighter/densest

question 8 (1 point)
jupiter and saturn are known as _?_ giants; the more distant uranus and neptune are called _?_ giants
o a ice/gas
o b gas/ice

question 9 (1 point)
mercury is basically a big ball of _?_ surrounded by, like, a tiny bit of _?_.
o a rock/metal
o b metal/rock

question 10 (1 point)
the solar system consists of the sun and _?_
o a planets their moons and rings
o b \debris\ asteroids, comets, and dust.
o c both
o d neither

Explanation:

• Question 7: Terrestrial planets (like Earth) have a core - mantle - crust structure. Dense metals (e.g., iron) sink to the core (due to gravity when the planet was molten), and lighter silicates (which make up the mantle and crust) are near the surface.
• Question 8: Jupiter and Saturn are gas giants, mainly composed of hydrogen and helium. Uranus and Neptune are ice giants, with a significant amount of ices (such as water - ice, methane - ice, etc.) in addition to some hydrogen and helium.
• Question 9: Mercury has a large metallic core (mostly iron) and a thin rocky crust.
• Question 10: The solar system consists of the Sun, planets, their moons, rings (e.g., Saturn's rings), asteroids, comets, and dust.

Answer:

• Question 7: A. densest/lighter
• Question 8: B. gas/ice
• Question 9: B. metal/rock
• Question 10: C. both