Ageologist needs to measure the density
of an irregularly shaped pebble.

a describe how she can find its volume by the method of displacement.

b what other measurement must she make if she is to find its density?

To find the volume of an irregularly shaped object, you need to use a measuring cylinder.

The measuring cylinder is filled with water up to a particular level and this volume is recorded. The irregularly shaped object is now added and the increase in the new volume of the water is noted.

The volume of the irregularly shaped object now becomes;

New volume of water - original volume of water.

The scientist must also measure the mass of the pebble since density is given as mass/volume.

The mass is measured using a spring balance.

link

density = mass / volume

use a eureka can to find the volume The can is filled to the top with water and the object placed in it. The volume of the object is equal to the volume of the water that is forced through the spout.

use a balance to find the mass (in kg)

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: