How old is the first primitive bacteria discovered?

What did the Polynesians used to navigate the oceans?

Protoearth was ________ than Earth today.

The largest of the ocean basins, which currently covers more than half of the ocean surface, is the ___________.

The method of determining latitude in the Northern Hemisphere by measuring the angle between an observer's line of site to the North Star and line of site to the northern horizon was developed by _____________.

The first person we are aware of who determined the circumference of the Earth using trigonometry and the angle of sunlight at Alexdandria, Egypt, was _______.

Most of the explorations by northern and western Europeans during the Middle Ages were undertaken by _______.

The European " Age of Discovery" began with __________.

Which of the following was not a ship of Captain James Cook's?

What is scurvy?

Which explorer was not known in the Age of the Discovery in Europe?

The first recorded circumnavigation of Africa was made by the _______.

Which of the following Vikings is credited with discovering Greenland?

What Viking started the colony Vinland?

Who sailed from Europe around the tip of Africa to India and established a new trade route?

Who is credited with being the first European to see the Pacific Ocean?

Who was killed in the Philippines during his last sea voyage after a skirmish with local people?

Who left Spain in September 1519 and became the first person to complete a circumnavigation of the globe when he returned to Spain three years later?

The Sun and the rest of the solar system formed about 5 billion years ago from a huge cloud of dust and gas called a ________.

The separation of the Earth into layers while it was molten was the result of the ________.

Oceanic crust is primarily ________.

What is the main rock type of continental crust?

Which later of the Earth behaves in a plastic manner?

Which layer of the Earth is composed of a liquid?

Evidence suggest that the Sun and the rest of the solar system formed about five _________ years ago.

Which of the following was true about the Protoearth?

How did the Moon form?

Which of the following is Earth's rigid layer that includes the crust plus the topmost portion of the mantle?

Which of the following is Earth's liquid iron-nickel layer?

Which of the following is Earth's solid iron-nickel layer?

Earth's primordial atmosphere most likely included __________.

Current scientific knowledge indicates that the most likely origin of most of Earth's oceans was due to _______.

Which of the following was not abundant in the early atmosphere?

Earth's initial atmosphere formed from ______.

One of the reasons that free oxygen in our atmosphere is important to the development and maintenance of life on Earth is because oxygen ________.

Earth's atmosphere became oxygen-rich about ____ years ago

How old were the microfossils of bacteria from the deep-water marine rocks that support the idea of life's origin on the deep-ocean floor?

An organism's response to environmental changes are called ___________.

When did Miller and Urey conduct their lab experiment that had major implications about the development of life on Earth?

Oxygen comprises about ______ % of the Earth's present atmosphere.

According to the fossil records on Earth, the earliest - known life - forms were primitive _________.

The most likely place for the basic building blocks for the development to life to interact and produce life is in Earth's __________.

Stanley Miller's 1952 experiment created ________ from the chemical ingredients thought to exist in Earth's early ocean.

The very earliest forms of life probably _______.

The great oxidation even resulted in the massive die - off of which of the following?

The Earth is approximately