The boundary between troposphere and stratosphere is called.

The rocks formed by cooling and solidification of molten rock material such as magma (e.g. basalt) are called rocks.

If the sources of pollution are not specific, multiple and unidentifiable then it is called.

A resource that cannot be replaced quickly by natural processes is called.

Enrichment of water bodies with nitrates and phosphates (inorganic nutrients) is known as.

The study of the interaction of living organisms and the natural environment is called.

The term for all the species of living organisms in a region or ecosystem at a specific time is called.

Green House effect refers to.

Which gas is mainly responsible for global warming.

The term green revolution was coined by.

A species restricted to a given area is.

IUCN Stands for.

The following is the correct food chain of an aquatic ecosystem.

The diversity between communities is called as.

Ozone layer is present in.

is a colorless, odorless and toxic gas is produced when organic material like coal and their product incompletely burnt.

General term for particles suspended in air is.

Sulphur dioxide and nitrogen oxides are transported by prevailing winds they form secondary pollutants such as nitric acid vapour, droplets of sulfuric acid descends on earth surface is called.

Ozone is a form of oxygen with atoms.

The major pollutant from automobile exhaust is.

The rapidly moving stream of charged particles that is being driven away from the sun is known as what?

About how many light years across is the Milky Way?

Which unlucky Apollo lunar landing was canceled after an oxygen tank exploded?

The only one planet in the solar system has a day which lasts longer than its year.

The first manned spacecraft.

Who was the first man to classify stars according to their brightness?

What is the star nearest to the sun?

The Orion Nebula is a good example of what kind of nebula?

What is the collection of small rocky bodies, otherwise known as minor planets, 99.8 percent of whose orbits lie between the orbits of Mars and Jupiter?

Elliptical, Spiral and Irregular are classifications of what type of astronomical systems?

Which of the following men wrote the book 'On the Revolutions of the Heavenly Spheres'?

The Magellanic Clouds are.

The VISUAL aurora consists of luminous arcs, rays or bands in the night sky, usually confined to high latitudes and located in the.

According to Kepler's Laws, all orbits of the planets are.

Which type of star is maintained by the pressure of an electron gas?

Io, Europa, Ganymede and Callisto are satellites of what planet?

Name the outer boundary of the sun's magnetic field?

Phobos and Deimos are moons that orbit which planet?

The two main radiation belts that surround the earth are known by what name?

The period from one full moon to the next is:

A pulsar is actually a:

What are the two bright spots of light on opposite sides of a halo around the sun called?

What are the Geminids, the Perseids, and the Leonids?

Astronomers use cepheids principally as measures of what?

95% of the Martian atmosphere is composed of what substance?

What is the motion called when a planet seems to be moving westward in the sky?

Who was the first individual to observe the phases of Venus?

What causes a planet to have a magnetic field?

What is the point at which the orbit of Mercury comes closest to the Sun called?

Which civilization developed and implemented the first solar calendar?

What percentage of the earth's atmosphere does O2 comprise?

Cirrus clouds are:

The name of a rapid rise of coastal water that accompanies the arrival of a cyclone is called:

In the nebular hypothesis, each planet is formed from which of the following?

The available incoming solar radiation is known as:

Which planet's axis is almost parallel to its orbital plane, making it spin nearly on its side?

With which US spacecraft did Neil Armstrong and Edwin Aldrin, Jr. land on the moon?

Which spacecraft was Laika, the first living creature sent into space?

Who was the first to suggest the idea of an artificial satellite?

The amount of light emitted by an object in a unit of time is known as

Which type of telescope is used for examining the moon and other planets of the solar system?

What is the scientific term used for the twinkling of stars?

What makes a planet a dwarf planet?

Who discovered the Crab Nebula?

What is the dark center of a sunspot called?

What is the nucleus of a comet made of?

Which astronomer formulated the modern big bang theory?

Who invented the telescope?

The first satellite to operate in geostationary orbit is:

What are the clouds of interstellar gas and dust that emit light in different colors called?

What two motions do all planets have?

Which is the name of a radio source that is very far from Earth?

Who discovered dark matter?

The doughnut-shaped zones of highly energetic charged particles trapped at high altitudes in the magnetic field of Earth are known as:

Which planets do not have a natural satellite?

The instance when the Sun is exactly above the Equator and day and night are of equal length is called:

What term describes the alignment of three celestial bodies?

Who discovered the laws of planetary motion?

What is a group of old stars closely packed in a symmetrical form called?

Which of the following technologies provides the least information about celestial bodies in our solar system?

What is the source of energy for the Sun?

The surfaces of planet Mercury and our moon contain some very large craters that are most likely the results of

As part of the modern theory of the origins of the elements, it is hypothesized that before the formation of the stars, most of the matter in the universe consisted of what atoms?

Stars begin their life cycle in

Which of these could increase average global temperatures?

When a layer of cool air at the surface of Earth is found under a layer of warmer air above it, the result is known as

Snow on the ground prevents polar climates from gaining heat by what mechanism?

Earth's atmosphere is divided into layers that are based upon their

Which is the most volcanic world in our solar system?

In 1962, Mariner 2 became the first spacecraft to successfully encounter another planet. What planet was this?

The gaseous water density of the atmosphere is more commonly known as what?

Rocks formed in layers are said to be

In a food chain of grassland ecosystem the top consumers are

Barnacles growing on the back of whale is an example for

The final stable community in an ecological succession is called

Which of the following levels of organization is arrange in correct sequence from most to least inclusive?

What is probably the most important factor affecting the distribution of biomes?

An organism’s (species’) niche is best described as the set of interactions between the organism and the 

Which of the following would increase the size of a population?

A pioneer species is

Which weather tool measures precipitation?

a higher albedo means

Air that is moving is called

Which is the driving force of the water cycle