Homework Assignment: 42 | BBC Compacta Solution For Class 8 PDF Download

Look at the words and phrases below. Rearrange them to form meaningful sentences. Write the correct sentences in the space provided. 

(1)
Ans (a) The earth’s crust heats up faster than was known.

Ans (b) Researchers used laser-based techniques to determine how long rocks take to conduct heat.

Ans (c) With increasing temperatures the conductivity decreased.

Or

Ans (c) The conductivity decreased with increasing temperatures.

Ans (d) In other words, the rocks heated up fast and stayed hot longer.

(2)
​Ans (a) A delta is formed where a river meets a standing body in water.

Ans (b) Deltas around the world are either eroding or have stopped progressing.

Ans (c) Climate change, sea level rise and flood management measures take the blame.

Ans (d) There is talk about diverting more water and sediments into the bay to save the ones drowning.

(3)
Ans (a) Urban noise pollution is playing havoc among birds.

Ans (b) They seem to have to sing at different frequencies to overcome traffic noises.

Ans (c) Just like humans, birds of the same species living in different areas also speak different dialects of their language.

Ans (d) Some of those dialects might be disappearing completely.

(4)
Ans (a) Everyone has the need to pray.

Ans (b) Prayer is a petition to a higher power.

Ans (c) It teaches one to see one’s problem in a much wider perspective.

Ans (d) Most of all, prayer brings about change in oneself even without God’s intervention.

(5)
Ans (a) Polio strikes irrespective of religion, caste or creed.

Ans (b) The deadly virus can attack your child as well.

Ans (c) The Government is making all-out efforts to eradicate polio from the country.

(6)
Ans (a) The King cobra is the world’s longest venomous snake, reaching lengths of 4 to 5.5 metres.

Ans (b) When the snake is provoked, it lifts one-third of its body straight off the ground.

Ans (c) It spreads its hood and emits a deep, raspy hiss that is more like a growl.

Ans (d) It can launch itself and strike while holding this ‘standing’ pose.

(7)
Ans (a) Yuri Gagarin was born on March 9, 1934 in a village named Klushino in Russia.

Ans (b) His father Alexey Ivanovich Gagarin was a carpenter and bricklayer.

Ans (c) His mother, Anna Timofeyevna Gagarina was a milkmaid.