Paragraph 2: The necessary space is there, however, in many forms. The commonest spaces are those
among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel. Beds of
this material, out of sight beneath the soil, are common. They are found wherever fast rivers carrying
loads of coarse sediment once flowed. For example, as the great ice sheets that covered North America
during the last ice age steadily melted away, huge volumes of water flowed from them. The water was
always laden with pebbles, gravel, and sand, known as glacial outwash, that was deposited as the flow
slowed down.
3. The word “out of sight” in the passage is closest in meaning to
A Far away
B Hidden
C Partly visible
D Discovered