Answer: B) Electromagnetic waves can travel through empty space.
Explanation:
Conduction: This type of heat transfer happens when there is direct contact between the two object. Example: heating a pan on stove.
Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) due to the movement of hot layers to the top and cold layers to the bottom which leads to convection currents. Example: Heating of swimming pool.
Radiation: This type of heat transfer happens when there is direct transfer of energy through empty space.The electromagnetic radiation from the surface of an object which is due to the object's temperature is radiation. Example: Heating of earth's surface.
A chemical property of soda ash is that it is an alkaline compound , of pH 11.6 in aqueous solution. The chemical name of soda ash is sodium carbonate. It is a sodium salt of carbonic acid and occurs as a white crystalline compound. It has a cooling alkaline taste. It can be found in the ashes of many plants. It is produced in large quantities from sodium chloride (common salt). It can be found as a mineral in mineral deposits of natron usually in seasonal lakes when the lakes dry up.
Answer:
Option D = Poor countries often cannot afford investments that ensure access to fresh water.
Explanation:
This question wants to test out knowledge on biodiversity and how the loss of water affects it. Fresh water is needed for plants to grow. Several activities by man such as the use of chemical and fertilizers been washed into the sea, oil spillage and so on causes the pollution of fresh water.
So, because of the great resources (money) of the wealthy countries they have access to good facilities as these countries make use of their money to make sure they are still having access to fresh water despite the pollution caused by man activities.
