Question

1. according to the passage, why is earth often called the \blue planet\?

a. because much of its surface is covered by water
b. because most of its freshwater is frozen
c. because it has many lakes and rivers
d. because glaciers and ice caps are blue

1. the passage states that about what percent of earths water is freshwater usable for human needs?

a. 1%
b. 3%
c. 30%
d. 69%

1. where is the largest portion of the worlds freshwater stored?

a. lakes and rivers
b. the atmosphere

Explanation:

Question 6

To determine why Earth is called the "blue planet", we analyze the options. Earth's surface is mostly covered by water (oceans, seas, etc.), which gives it a blue appearance from space. Option A aligns with this. Option B refers to frozen freshwater, not the main reason for the blue planet name. Option C focuses on lakes/rivers, which are a small part of Earth's water. Option D about glaciers/ice caps being blue is incorrect as the blue planet name is due to overall water coverage.

Regarding the percentage of Earth's water that is usable freshwater for humans, scientific knowledge tells us that only a very small percentage (around 1%) of Earth's total water is freshwater available for human use (after accounting for frozen, saline, etc.). Option A (1%) is correct. Option B (3%) is the total freshwater (including frozen), C (30%) and D (69%) are incorrect as they don't match the usable freshwater percentage.

The largest portion of the world's freshwater is stored in glaciers and ice caps (though options here seem cut off, but from standard knowledge). If options included glaciers/ice caps, that would be correct. But assuming the intended correct option related to frozen water storage (like glaciers, ice caps) or similar, but with given partial options, if we consider typical knowledge, the largest freshwater is in glaciers/ice caps. However, with the provided (cut) options, if we assume the correct one is related to frozen storage or similar, but since options are incomplete, but from standard content, the largest freshwater is in glaciers and ice caps.

Answer:

A. Because much of its surface is covered by water

Question 7