Answer:
Answer is option C (protoplanets).
Explanation:
During the formation of the solar system, a giant cloud of molecular dust collapsed to form stars, which were surrounded by a cloud of gas. The dust and other particles inside the cloud collide and merge together into larger mass through the gravitational and other forces. They continue to grow and become large enough to gravitationally attract other small celestial objects to form protoplanets. Some of the protoplanets continue their growth through the process called accretion and form planets.
Planetesimals - The small celestial objects formed during the early stages of the creation of the solar system.
Protoplanets - The objects formed when planetesimals became large enough to attract their neighboring celestial bodies through the force of gravity and grow by the process known as accretion, where they collide and merge together into larger bodies.
Extrasolar planets - The planets found outside our solar system (orbit another star, not the Sun).
-70+40 is like subtracting 70 and 40, but adding a negative sign in front. The answer is -30
No horizontal displacement
A contour line is a line of 'equal height': every point on a contour is the same height above sea level.
The closer any two contour lines are the steeper the hill is: and the further apart they are the move level the ground.
If a group of contour lines suddenly move to form a V shape then the hill either has a promontory sticking out from it or a valley in it.
