Science- Weather, Air and Water Online Practice Exams

Science- Weather, Air and Water

Free Mock Test

Questions 29
Maximum mark 57

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Science- Weather, Air and Water Online Practice Exams FAQs

1. What is Weather and how is it different from Climate?

Weather refers to the atmospheric conditions in a specific place and time. It includes factors like temperature, humidity, wind speed, and precipitation. Climate, on the other hand, is the long-term average of weather conditions in a particular region over an extended period. While weather changes frequently and can vary from day to day, climate represents the typical patterns that characterize a location.

2. How is Air essential for life on Earth?

Air is vital for life on Earth in several ways:

Respiration: Humans and many other living organisms rely on air to breathe and carry out respiration, exchanging oxygen for carbon dioxide.
Photosynthesis: Plants use carbon dioxide from the air during photosynthesis, producing oxygen as a byproduct.
Wind: Air movement, such as wind, plays a role in distributing heat, moisture, and seeds, which affects weather and ecosystems.
Weather Patterns: Air circulation patterns influence weather and climate, impacting the distribution of heat and precipitation around the globe.

Understanding the importance of air highlights its significance in sustaining life on our planet.

3. What are the different forms of Water on Earth?

Water exists in various forms on Earth:

Liquid Water: The most common form, found in oceans, lakes, rivers, and groundwater.
Ice: Solid water, as ice, is present in glaciers, icebergs, and polar regions.
Water Vapor: Gaseous water, or water vapor, is an invisible gas present in the atmosphere.
Clouds: Clouds are composed of tiny water droplets or ice crystals suspended in the air.

The different forms of water play critical roles in the Earth's climate and hydrological cycles.

4. How do Clouds form, and what do they indicate about the Weather?

Clouds form when warm, moist air rises and cools, causing the water vapor to condense into tiny water droplets or ice crystals around particles in the atmosphere. Different types of clouds indicate various weather conditions:

Cumulus Clouds: Puffy, white clouds that often indicate fair weather.
Stratus Clouds: Layered clouds that can bring overcast skies and light rain or drizzle.
Cirrus Clouds: Thin, wispy clouds that typically form at high altitudes and indicate fair weather.
Cumulonimbus Clouds: Towering clouds associated with thunderstorms, heavy rain, and lightning.

Observing clouds helps meteorologists predict and understand weather patterns.

5. How is the Water Cycle essential for maintaining the Earth's Ecosystem?

The water cycle, also known as the hydrological cycle, is crucial for sustaining the Earth's ecosystems:

Evaporation: Heat from the Sun causes water to evaporate from oceans, lakes, and other bodies of water, turning into water vapor.
Condensation: Water vapor rises and cools in the atmosphere, condensing into clouds.
Precipitation: Water droplets in clouds combine and fall back to the Earth as rain, snow, sleet, or hail.
Runoff and Infiltration: Precipitated water flows over the land, replenishing lakes and rivers, and infiltrates into the ground to recharge groundwater sources.

The water cycle supports plant growth, provides freshwater for drinking, and maintains habitats for various organisms.