Test: Air & Water - 1 - Grade 4 MCQ

High humidity means there is already a high amount of water vapor in the air, making it more difficult for water to evaporate.

Weather refers to the current conditions of the atmosphere, including temperature, humidity, precipitation, wind speed, and atmospheric pressure. It describes the conditions we experience on a day-to-day basis.

The dew point is the temperature at which the air becomes saturated with water vapor, leading to condensation. When the rate of evaporation matches the rate of condensation, it indicates that the air has reached its maximum capacity to hold water vapor, and any further cooling of the air will result in the formation of dew, fog, or cloud droplets.
Therefore, the correct answer is C: The dew point is reached.

The sun's energy plays a crucial role in the water cycle, which involves the processes of evaporation, condensation, precipitation, and collection of water on Earth.

Changes in weather are primarily caused by the interaction of different air masses with varying temperature, humidity, and pressure. When air masses of different characteristics meet, they can lead to the formation of weather systems and changes in weather conditions.

The tilt of the Earth's axis relative to its orbit around the sun is responsible for the change of seasons. As the Earth orbits the sun, different parts of the planet receive varying amounts of sunlight, resulting in the seasons.

This statement is not true. While wind patterns can be complex and influenced by various factors, they follow certain patterns and can be studied and predicted. Winds are driven by the differences in atmospheric pressure and generally blow from areas of high pressure to areas of low pressure.

The water cycle refers to the continuous movement of water on, above, and below the Earth's surface. It involves processes such as evaporation, condensation, precipitation, and runoff.

Changes in weather are primarily caused by the interaction of different air masses with varying temperature, humidity, and pressure. This interaction leads to the formation of weather systems and the associated changes in conditions.

Ice crystals. When temperatures drop below the freezing point of water (0°C or 32°F), water vapor in a cloud can crystallize to form ice crystals. These ice crystals can further grow and combine to form snowflakes or other frozen precipitation.