The Mariner 10 spacecraft was the one who discovered the exosphere when it was sent on Mercury in 1974.
<h2><u>Hello </u><u>There</u></h2>


The Cultivation of Fruits, Vegetables and Flowers for domestic and international markets are called Horticulture.

It is science, art and occupation of cultivating the soil, producing crops and livestock. It is systematic and controlled use of living organisms and the environment to improve the human condition.
<h3>Hope This Helps</h3>
The answer is 20. Frequency is "number of times" per unit time.
Answer:
Velocity has a direction associated with it, while speed has no specific direction.
Explanation:
Velocity is a vector, while speed is a scalar.