Question

13. We can see an object when
a) light falls on it
b) light from the object bounces back to our eyes
c) light do not fall on it
d) none of these

14.The type of substances which form unclear shadows
a) transparent substances
b) translucent substances
c) opaque substances
d) both (a) and (b)

15. The substances which do not form shadows are called
a) translucent
b) transparent
c) opaque
d) none of these​

Answer 1

Answer:

Tectonic plates are broken pieces made of the Earth's crust or lithosphere. Another name for them is crustal plates. Continental crust is less dense, and oceanic crust is denser. These rigid plates can move in different directions, shifting constantly.

Answer 2

Answer:

13.b)

14.d)

15.b)

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