(i) Seals are clay tablets have been found from various Harappan sites. They have figures of animals, trees and various letters carved on them.
(ii) Seals may have been used to stamp bags or packets containing goods that were sent from one place to another.
(iii) After a bag was closed or tied, a layer of wet clay was applied on the knot and seal was pressed on it
(iv) The impression of the seal is known as sealing. If the sealing was intact, one could be sure that the goods cased arrived safely.

The farmers and herders in the earlier period cultivated the fields themselves and domesticated the animals. The farmers and herders who gave food to the Harappan cities knew about agriculture and domestication of animals. So, they supplied food to the city dwellers and they also provided their own food.

Lothal to Mohanjodaro's journey will be done on bullock carts along the dusty roads. My parents will carry food, water and clothes. In Mohanjodaro, I would see:
(i) Citadels
(ii) Big storehouses
(iii)A great tank i.e., the Great Bath
(iv) Wells
(v) Streets with covered drains
(vi) Houses of one or two storeys.

(i) The picture shows stone weights.
(ii) They were made of chert stone.
(iii) They were used to weigh precious stones or metals.

(i) A stone statue of an important man found from Mohenjodaro.
(ii) He is wearing an embroidered garment.

(i) Above picture refers to beads.
(ii) Many of these were made out of carnelian, a beautiful red stone.
(iii) A hole was bored through centre so that a string could be passed through it.

(i) The Great Bath of Mohenjodaro
(ii) It was constructed by bricks and coated with plaster.
(iii) Harappan cities
(iv) (a) There were steps leading down to bottom.
(b) Water was drained out after use.

Reasons for the fall of the Harappan cities were:
(i) Till date, no concrete reason has been found out by the scholars, but some of the scholars suggested that the rivers dried up.
(ii) While other scholars have suggested that there was deforestation because large quantity of fuel was required for baking bricks and for smelting copper ores.
(iii) Besides, grazing by large herds of cattle, sheep and goat may have destroyed the green cover. In some areas there were floods.
(iv) But none of these reasons can explain the end of all the cities since the flooding, or a river drying up would have had an effect in only some areas.
(v) Some sites in Sind and West Punjab (present-day Pakistan) were abandoned, while many people moved into newer, smaller settlements to the East and the South, it seems as if the rulers lost control over their subjects.

In some cities, special buildings were constructed on the citadel. In Mohenjodaro, a very special tank, which archaeologists call the Great Bath, was built. This was lined with bricks, coated with plaster and made water-tight with a layer of natural tar. 
There were steps leading down to it from two sides, while there were rooms on all sides. Water was probably brought in from a well and drained out after use. Perhaps important people took a dip in this tank on special occasions.

Many of the Harappan cities had covered drains. These are as follow:
(i) We can notice how carefully these were laid out, in straight lines. However, each drain had a gentle slope so that water could flow through it.
(ii) The drains in houses were connected to those on the streets and smaller drains led into bigger ones.
(iii) As the drains were covered, inspection holes were provided at intervals to clean them. All three - houses, drains and streets - were probably planned and built at the same time.