Exploring Forces — Science STD 8 — Question

If a vacuum is created between two Magdeburg hemispheres joined together, they cannot be separated easily, What presses the hemispheres together?

Write a paragraph in your own words on each of the following.
Threshing

Imagine you are in charge of a school health campaign. What key messages would you use to reduce communicable and non-communicable diseases?

Explain why, frying pan handles are made of thermosetting plastics.

What precautions would you take to protect yourself during an earthquake if you are outdoors?

Stars appear as point while planets appear as discs. Explain why?

Identify the following micro-organisms:
(i) I live in every kind of environment, and inside your gut.
(ii) I make bread and cakes soft and fluffy.
(iii) I live in the roots of pulse crops and provide nutrients for their growth.

Name the process by which plant material (or vegetation) buried deep under the earth was slowly converted into coal.

Aditya visited a lake on two days. On the first day, the reflection of the surrounding mountains could be seen clearly in water of the lake. On the second day, he was not able to see the reflection of the mountains clearly. Give one possible reason for this phenomenon and explain your answer clearly.

Define budding.