Question

1. choose the best answer.

the ______ is the area of the solar system that is under the gravitational and magnetic influence of the sun.
mesosphere
lithosphere
heliosphere
ionosphere

1. choose the best answer.

the ______ is a hypothetical vast region of interstellar space where long - period comets are believed to form.
oort cloud
pluto plane
alpha quadrant
great beyond

Explanation:

Question 7

To determine the region of the solar system under the Sun's gravitational and magnetic influence, we analyze the options:

• Mesosphere: Part of Earth's atmosphere, not solar - system - wide.
• Lithosphere: Earth's rigid outer layer, not related to solar system influence.
• Heliosphere: Defined as the region of the solar system where the solar wind (carrying the Sun's magnetic field and gravitational influence) dominates over interstellar medium.
• Ionosphere: Part of Earth's upper atmosphere.

So the heliosphere is the correct region.

To identify the region where long - period comets are believed to form:

• Oort cloud: A theoretical, vast region of interstellar space around the solar system where long - period comets are thought to originate.
• Pluto plane: Not a recognized region for comet formation.
• Alpha quadrant: A term from science fiction (Star Trek), not a scientific region for comet formation.
• Great beyond: A non - scientific, vague term.

So the Oort cloud is the correct answer.

Answer:

The option corresponding to heliosphere (the option with "heliosphere" text)

Question 8