photosynthesis

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What’s the atmosphere? Weather science

By |2018-09-23T20:18:36+00:00August 19th, 2017|Physics|

Earth's atmosphere: Did the Earth look like this right after it cooled down? What is the atmosphere? The atmosphere is the air that is wrapped all around a planet. Read more about planets Do all planets have atmospheres? Not all planets have atmospheres. In order to have an atmosphere, the planet has to have [...]

Mars, the red planet – Astronomy

By |2018-05-31T11:49:29+00:00August 18th, 2017|Physics|

Mars, the way the planet looks from space The closest planet to Earth is Mars, and Mars is also the planet that seems most likely to have life on it besides our own Earth. It's the next planet further away from the Sun after Earth. When you look at Mars from Earth, it looks reddish, and even [...]

Earthquakes and algae – the planet Earth

By |2018-05-31T11:49:27+00:00August 18th, 2017|Physics|

Molten lava Most of the molecules that smashed together to make the Earth were iron. The smashing together released a lot of heat, so the whole center of the Earth is made of hot melted iron. Because iron is heavier than most other metals, it sank to the center of the Earth. Lighter molecules like silicon and [...]

What is moss? Plant Biology and Evolution

By |2017-05-29T22:55:45+00:00May 29th, 2017|Biology|

A moss-covered rock During the Cambrian period, about 540 million years ago, some early plants evolved from earlier algae that could live on land, outside of the water. These plants were like modern moss. All of the animals were still living in the water, so on land there was only moss and mushrooms. [...]

What is a prokaryote – Cell biology

By |2018-09-11T05:51:18+00:00May 29th, 2017|Biology|

A prokaryote (seen through a microscope) What does "prokaryote" mean? The simplest living cells are called prokaryotes, which is Greek for "before the nucleus" - these are cells that were so simple that they didn't have a nucleus. When did the first prokaryotes evolve? The first prokaryotes probably evolved from even simpler cells [...]

What is photosynthesis? Plant Biology

By |2018-04-16T00:37:36+00:00May 29th, 2017|Biology|

Chloroplasts (seen through a microscope) Photosynthesis is the way some cells on Earth pull in light from the sun and use it to make energy to repair and reproduce themselves. The first cells could not photosynthesize (foe-toe-SIN-the-size). They got food by breaking apart hydrocarbon molecules. But a little more than three billion years ago, [...]

What is a chloroplast? Parts of a cell – Biology

By |2018-04-16T10:16:02+00:00May 28th, 2017|Biology|

Chloroplasts (seen through a microscope) The first cells that could make sugars out of sunlight and carbon dioxide and water by photosynthesis probably evolved around 3.8 billion years ago. They were prokaryotic cells that looked blue-green, because they needed to absorb all the warmer wavelengths of light and reflect the cooler blue and [...]