U9Ch3

What tool did early explorers use to determine direction?

• A telescope

• A compass

• A map

• A sundial

How did sailors use a compass to help them navigate?

• By measuring the distance to the North Star

• By determining which direction was north

• By calculating the speed of the ship

• By finding familiar landmarks

What is the main idea of the passage about early explorers?

• Early explorers used modern technology to navigate.

• Early explorers relied on various tools to navigate unknown waters.

• Early explorers always stayed close to land.

• Early explorers used maps that were always accurate.

Which tool did sailors use to track their position using the stars?

• A compass

• A quadrant

• A telescope

• A map

Retell how dead reckoning was used by sailors to estimate their speed.

• Sailors used a compass to find the direction and speed.

• Sailors used a piece of wood and a knotted rope to measure speed.

• Sailors used the stars to calculate speed.

• Sailors used maps to determine speed.

What inference can be made about the importance of the North Star for sailors?

• It was used to measure the depth of the ocean.

• It helped sailors determine their position on Earth.

• It was used to calculate the speed of the ship.

• It was a landmark for familiar routes.

Why was dead reckoning important for early explorers?

• It allowed them to find familiar landmarks.

• It helped them estimate their speed and distance traveled.

• It provided accurate maps for navigation.

• It was used to communicate with other ships.

Paraphrase how a compass works according to the passage.

• A compass uses the sun to determine direction.

• A compass uses a magnet to point north due to Earth's magnetic field.

• A compass uses water currents to find direction.

• A compass uses the moon to navigate.

What evidence from the text supports the idea that early maps were not always reliable?

• Explorers used the stars to navigate.

• Explorers had to rely on tools like the compass and quadrant.

• Explorers stayed close to land.

• Explorers used electronic devices for directions.

What can be inferred about the challenges faced by early explorers?

• They had access to accurate maps and technology.

• They had to navigate without modern tools and accurate maps.

• They only traveled during the day.

• They relied solely on electronic devices.