Here are the answers to your questions:
Question 1:
b - Hydrogen
Question 2:
d - The chaotic magnetic field of the Sun
Question 3:
a - Nebulae
Question 4:
a - The Sun's magnetic fields cause plasma on the surface to cool down and turn dark
Question 5:
a - The area swept out by an orbiting object must be the same for the same time period at any point of the orbital path
Question 6:
d - A force of attraction between all objects in the universe that have mass
Question 7:
d - The orbits are elliptical in shape with the Sun as one of the foci of the ellipse
Question 8:
c - The heliocentric theory states that the Sun is the center of the Solar System
Question 9:
d - All of the above
Question 10:
Please specify the picture, but generally speaking:
b - Spiral (assuming it's a spiral galaxy based on common knowledge)
Question 11:
b - Outer area; the radiation from stars tends to put radiative pressure on nearby stars, eventually pushing them outward.
Question 12:
d - Almost all light in the Universe is red-shifting, meaning those objects creating that light are moving away from each other
Question 13:
a - There is not enough mass in galaxies to produce the gravitational force that exists, so Dark Matter must make up the remaining gravitational force needed to hold a galaxy together.
Question 14:
a - Igneous rocks
Question 15:
To determine the oldest layer, typically it would be the bottom layer, which would depend on the diagram provided.
Question 16:
Order from youngest to oldest:
2. Nebula
4. Protostar
5. Main Sequence Star (larger)
- Red Supergiant
- Supernova
- Black Hole
Question 17:
True
Question 18:
c - Frost Wedging
Question 19:
Blank 1: weathering
Blank 2: glaciers
Blank 3: wind
Blank 4: erosion
Blank 5: deposition
Question 20:
d - Water
Feel free to ask if you have any further questions!