How far can light travel in one year?
a. 30 million km
b. 10 trillion km
c. 300,000 km
d. 100 billion km

B. 10 trillion km

Explanation:

“ It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. ”

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

the doppler effect is used by weather forecasters to measure 

moving clouds