Question

how are elements that are heavier than hydrogen spread throughout the universe?
a) when a star explodes as a supernova
b) when a star collapses into a neutron star
c) when a star collapses as a black hole
d) when a star forms into a red giant
question 15 (5 points)
which of the following is/are characteristic of the earth but not the moon?
a) volcanoes
b) plate tectonics
c) asteroid impacts
d) molten core

Explanation:

• For the first question:
• A supernova explosion scatters the heavy - element - rich material (elements heavier than hydrogen) that was formed in the star's core during its life cycle into space.
• When a star collapses into a neutron star (B), it is a more compact event and does not spread heavy elements in the same way as a supernova. A black - hole collapse (C) also does not spread heavy elements. A red - giant formation (D) is a stage in a star's life but does not spread heavy elements like a supernova.
• For the second question:
• Plate tectonics is a characteristic of the Earth. The Moon has a much more geologically inactive interior and does not have plate - like movements.
• Both the Earth and the Moon have had volcanoes (A) in their past (the Moon has extinct volcanoes). Both have experienced asteroid impacts (C). The Moon has a partially molten core (D), but it is not as active as the Earth's core in terms of driving large - scale geological processes like plate tectonics.

Answer:

First question: A. When a star explodes as a supernova
Second question: B. Plate tectonics