17. Which of these processes is the result of the motion of particles in a gas or liquid? A. conduction
B convection
C. insulation
D. radiation

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.