2 Probes are sometimes sent into space. Some have been sent to orbit planets. Landing
on a planet, however, is necessary to gather what kind of data?
А
Taking photographs
B
Measuring diameter
с
Collecting soil samples
D
Determining temperature of atmosphere

Determining temperature of atmosphere

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)