Plz ＞﹏＜ and hurry Several kilometers from a volcano, a geologist observes an old lava flow made up of dark-colored basalt rock. The geologist infers that the lava must have had

a. high silica content.

b. high viscosity.

c. low viscosity.

d. medium viscosity.

this is for you telling me what he did

Explanation:  it D

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =