Answer:
B or D
Explanation:
think of it how you use chalk on a chalk board, its less friction using chalk instead lets say a marker on a white board.
Answer:
Metamorphic rocks are almost always harder than sedimentary rocks. They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away.
Because their mineral grains grew together tightly during metamorphism, they're generally strong rocks.
Smaller droplets scatter more sunlight while large drops allow more sunlight to pass through in clouds.
Answer:
Brain, Spinal cord & nerves/neurons
Explanation:
N/A
A controlled variable is not changed throughout an experiment. It is there so that the other variables being tested on can be better understood.
