The answers would be:
Terrae
Deep areas of cooled lava
Here is more about your question:
<u>Terrae </u>is also known as the highlands of the moon's surface. The highlands are lighter in color than the other areas of the moon. They are mostly made up of feldspar. It is lighter in color because it reflects most of the light. These features formed as the lunar ocean cooled down.
<u>Maria </u>on the other hand, are the darker features of the moon. The singular form is Mare. These are areas of cooled lava that seeped out of the moon's interior as meteors hit it. They are mostly made up of basalt. These areas are dark, solid and flat.
The value of V is 640 km/hr.
<h3>What is Average velocity?</h3>
Average velocity is the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs.
To calculate the value of V from the question, we use the formula below.
- V' = (V+U)/2............ Equation 1
Making V the subject of the equation
- V = 2V'-U.............. Equation 2
From the question,
⇒ Given:
- V' = 520 km/hr
- U = 400 km/hr
Substitute these values into equation 2
- V = (520×2)-400
- V = 640 km/hr
Hence, the value of V is 640 km/hr.
Learn more about average velocity here: brainly.com/question/4931057
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Ina vacuum, it is a constant value that does not depend on the observer.
Your radiologist is a medical doctor who specializes in diagnosing and treating disease and injury, using medical imaging techniques such as x-rays, computed tomography (CT), magnetic resonance imaging (MRI), nuclear medicine, positron emission tomography (PET), fusion imaging, and ultrasound.